First commit to migrate the following articles from core-java:
* to core-java-lang: * https://www.baeldung.com/java-reflection * https://www.baeldung.com/java-generics * https://www.baeldung.com/java-eclipse-equals-and-hashcode * https://www.baeldung.com/java-chained-exceptions * https://www.baeldung.com/java-primitive-conversions //to package * https://www.baeldung.com/java-method-reflection * https://www.baeldung.com/java-enum-iteration * https://www.baeldung.com/java-reflection-change-annotation-params * https://www.baeldung.com/java-dynamic-proxies * https://www.baeldung.com/java-double-brace-initialization * https://www.baeldung.com/java-hashcode * https://www.baeldung.com/java-diamond-operator * https://www.baeldung.com/java-static (?https://github.com/eugenp/tutorials/pull/3392) * https://www.baeldung.com/java-comparator-comparable * https://www.baeldung.com/java-continue-and-break * https://www.baeldung.com/java-initialization * https://www.baeldung.com/java-nested-classes * https://www.baeldung.com/java-loops * https://www.baeldung.com/java-varargs
This commit is contained in:
geroza
@@ -1,138 +0,0 @@
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package com.baeldung.breakcontinue;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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/**
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* @author Santosh
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*
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*/
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public class BreakContinue {
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public static int unlabeledBreak() {
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String searchName = "Wilson";
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int counter = 0;
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List<String> names = Arrays.asList("John", "Peter", "Robert", "Wilson", "Anthony", "Donald", "Richard");
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for (String name : names) {
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counter++;
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if (name.equalsIgnoreCase(searchName)) {
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break;
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}
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}
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return counter;
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}
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public static int unlabeledBreakNestedLoops() {
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String searchName = "Wilson";
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int counter = 0;
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Map<String, List<String>> nameMap = new HashMap<>();
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nameMap.put("Grade1", Arrays.asList("John", "Peter", "Robert", "Wilson"));
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nameMap.put("Grade2", Arrays.asList("Anthony", "Donald", "Richard", "Arnold"));
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nameMap.put("Grade3", Arrays.asList("Wilson", "Michael", "Stephen", "Ryan"));
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Iterator<Entry<String, List<String>>> iterator = nameMap.entrySet()
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.iterator();
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Entry<String, List<String>> entry = null;
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List<String> names = null;
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while (iterator.hasNext()) {
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entry = iterator.next();
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names = entry.getValue();
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for (String name : names) {
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if (name.equalsIgnoreCase(searchName)) {
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counter++;
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break;
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}
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}
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}
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return counter;
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}
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public static int labeledBreak() {
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String searchName = "Wilson";
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int counter = 0;
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Map<String, List<String>> nameMap = new HashMap<>();
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nameMap.put("Grade1", Arrays.asList("John", "Peter", "Robert", "Wilson"));
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nameMap.put("Grade2", Arrays.asList("Anthony", "Donald", "Richard", "Arnold"));
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nameMap.put("Grade3", Arrays.asList("Wilson", "Michael", "Stephen", "Ryan"));
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Iterator<Entry<String, List<String>>> iterator = nameMap.entrySet()
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.iterator();
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Entry<String, List<String>> entry = null;
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List<String> names = null;
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compare:
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while (iterator.hasNext()) {
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entry = iterator.next();
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names = entry.getValue();
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for (String name : names) {
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if (name.equalsIgnoreCase(searchName)) {
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counter++;
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break compare;
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}
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}
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}
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return counter;
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}
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public static int unlabeledContinue() {
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String searchName = "Wilson";
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int counter = 0;
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Map<String, List<String>> nameMap = new HashMap<>();
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nameMap.put("Grade1", Arrays.asList("John", "Wilson", "Robert", "Wilson"));
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nameMap.put("Grade2", Arrays.asList("Anthony", "Donald", "Wilson", "Arnold"));
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nameMap.put("Grade3", Arrays.asList("Wilson", "Michael", "Wilson", "Ryan"));
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Iterator<Entry<String, List<String>>> iterator = nameMap.entrySet()
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.iterator();
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Entry<String, List<String>> entry = null;
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List<String> names = null;
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while (iterator.hasNext()) {
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entry = iterator.next();
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names = entry.getValue();
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for (String name : names) {
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if (!name.equalsIgnoreCase(searchName)) {
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continue;
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}
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counter++;
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}
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}
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return counter;
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}
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public static int labeledContinue() {
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String searchName = "Wilson";
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int counter = 0;
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Map<String, List<String>> nameMap = new HashMap<>();
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nameMap.put("Grade1", Arrays.asList("John", "Wilson", "Robert", "Wilson"));
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nameMap.put("Grade2", Arrays.asList("Anthony", "Donald", "Wilson", "Arnold"));
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nameMap.put("Grade3", Arrays.asList("Wilson", "Michael", "Wilson", "Ryan"));
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Iterator<Entry<String, List<String>>> iterator = nameMap.entrySet()
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.iterator();
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Entry<String, List<String>> entry = null;
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List<String> names = null;
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compare:
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while (iterator.hasNext()) {
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entry = iterator.next();
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names = entry.getValue();
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for (String name : names) {
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if (name.equalsIgnoreCase(searchName)) {
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counter++;
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continue compare;
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}
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}
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}
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return counter;
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}
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}
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@@ -1,41 +0,0 @@
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package com.baeldung.chainedexception;
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import com.baeldung.chainedexception.exceptions.GirlFriendOfManagerUpsetException;
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import com.baeldung.chainedexception.exceptions.ManagerUpsetException;
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import com.baeldung.chainedexception.exceptions.NoLeaveGrantedException;
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import com.baeldung.chainedexception.exceptions.TeamLeadUpsetException;
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public class LogWithChain {
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public static void main(String[] args) throws Exception {
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getLeave();
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}
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private static void getLeave() throws NoLeaveGrantedException {
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try {
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howIsTeamLead();
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} catch (TeamLeadUpsetException e) {
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throw new NoLeaveGrantedException("Leave not sanctioned.", e);
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}
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}
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private static void howIsTeamLead() throws TeamLeadUpsetException {
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try {
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howIsManager();
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} catch (ManagerUpsetException e) {
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throw new TeamLeadUpsetException("Team lead is not in good mood", e);
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}
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}
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private static void howIsManager() throws ManagerUpsetException {
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try {
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howIsGirlFriendOfManager();
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} catch (GirlFriendOfManagerUpsetException e) {
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throw new ManagerUpsetException("Manager is in bad mood", e);
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}
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}
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private static void howIsGirlFriendOfManager() throws GirlFriendOfManagerUpsetException {
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throw new GirlFriendOfManagerUpsetException("Girl friend of manager is in bad mood");
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}
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}
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@@ -1,44 +0,0 @@
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package com.baeldung.chainedexception;
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import com.baeldung.chainedexception.exceptions.GirlFriendOfManagerUpsetException;
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import com.baeldung.chainedexception.exceptions.ManagerUpsetException;
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import com.baeldung.chainedexception.exceptions.NoLeaveGrantedException;
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import com.baeldung.chainedexception.exceptions.TeamLeadUpsetException;
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public class LogWithoutChain {
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public static void main(String[] args) throws Exception {
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getLeave();
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}
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private static void getLeave() throws NoLeaveGrantedException {
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try {
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howIsTeamLead();
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} catch (TeamLeadUpsetException e) {
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e.printStackTrace();
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throw new NoLeaveGrantedException("Leave not sanctioned.");
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}
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}
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private static void howIsTeamLead() throws TeamLeadUpsetException {
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try {
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howIsManager();
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} catch (ManagerUpsetException e) {
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e.printStackTrace();
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throw new TeamLeadUpsetException("Team lead is not in good mood");
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}
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}
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private static void howIsManager() throws ManagerUpsetException {
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try {
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howIsGirlFriendOfManager();
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} catch (GirlFriendOfManagerUpsetException e) {
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e.printStackTrace();
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throw new ManagerUpsetException("Manager is in bad mood");
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}
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}
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private static void howIsGirlFriendOfManager() throws GirlFriendOfManagerUpsetException {
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throw new GirlFriendOfManagerUpsetException("Girl friend of manager is in bad mood");
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}
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}
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-12
@@ -1,12 +0,0 @@
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package com.baeldung.chainedexception.exceptions;
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public class GirlFriendOfManagerUpsetException extends Exception {
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public GirlFriendOfManagerUpsetException(String message, Throwable cause) {
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super(message, cause);
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}
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public GirlFriendOfManagerUpsetException(String message) {
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super(message);
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}
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}
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-12
@@ -1,12 +0,0 @@
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package com.baeldung.chainedexception.exceptions;
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public class ManagerUpsetException extends Exception {
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public ManagerUpsetException(String message, Throwable cause) {
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super(message, cause);
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}
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public ManagerUpsetException(String message) {
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super(message);
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}
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}
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-12
@@ -1,12 +0,0 @@
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package com.baeldung.chainedexception.exceptions;
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public class NoLeaveGrantedException extends Exception {
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public NoLeaveGrantedException(String message, Throwable cause) {
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super(message, cause);
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}
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public NoLeaveGrantedException(String message) {
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super(message);
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}
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}
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-12
@@ -1,12 +0,0 @@
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package com.baeldung.chainedexception.exceptions;
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public class TeamLeadUpsetException extends Exception {
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public TeamLeadUpsetException(String message, Throwable cause) {
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super(message, cause);
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}
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public TeamLeadUpsetException(String message) {
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super(message);
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}
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}
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@@ -1,51 +0,0 @@
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package com.baeldung.comparable;
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public class Player implements Comparable<Player> {
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private int ranking;
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private String name;
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private int age;
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public Player(int ranking, String name, int age) {
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this.ranking = ranking;
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this.name = name;
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this.age = age;
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}
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public int getRanking() {
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return ranking;
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}
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public void setRanking(int ranking) {
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this.ranking = ranking;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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@Override
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public String toString() {
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return this.name;
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}
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@Override
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public int compareTo(Player otherPlayer) {
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return (this.getRanking() - otherPlayer.getRanking());
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}
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}
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@@ -1,25 +0,0 @@
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package com.baeldung.comparable;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class PlayerSorter {
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public static void main(String[] args) {
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List<Player> footballTeam = new ArrayList<Player>();
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Player player1 = new Player(59, "John", 20);
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Player player2 = new Player(67, "Roger", 22);
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Player player3 = new Player(45, "Steven", 24);
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footballTeam.add(player1);
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footballTeam.add(player2);
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footballTeam.add(player3);
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System.out.println("Before Sorting : " + footballTeam);
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Collections.sort(footballTeam);
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System.out.println("After Sorting : " + footballTeam);
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}
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|
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}
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@@ -1,46 +0,0 @@
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package com.baeldung.comparator;
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public class Player {
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private int ranking;
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private String name;
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private int age;
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public Player(int ranking, String name, int age) {
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this.ranking = ranking;
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this.name = name;
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this.age = age;
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}
|
||||
|
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public int getRanking() {
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return ranking;
|
||||
}
|
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|
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public void setRanking(int ranking) {
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this.ranking = ranking;
|
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}
|
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|
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public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
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}
|
||||
|
||||
public int getAge() {
|
||||
return age;
|
||||
}
|
||||
|
||||
public void setAge(int age) {
|
||||
this.age = age;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return this.name;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,12 +0,0 @@
|
||||
package com.baeldung.comparator;
|
||||
|
||||
import java.util.Comparator;
|
||||
|
||||
public class PlayerAgeComparator implements Comparator<Player> {
|
||||
|
||||
@Override
|
||||
public int compare(Player firstPlayer, Player secondPlayer) {
|
||||
return (firstPlayer.getAge() - secondPlayer.getAge());
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,27 +0,0 @@
|
||||
package com.baeldung.comparator;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
public class PlayerAgeSorter {
|
||||
|
||||
public static void main(String[] args) {
|
||||
|
||||
List<Player> footballTeam = new ArrayList<Player>();
|
||||
Player player1 = new Player(59, "John", 22);
|
||||
Player player2 = new Player(67, "Roger", 20);
|
||||
Player player3 = new Player(45, "Steven", 24);
|
||||
footballTeam.add(player1);
|
||||
footballTeam.add(player2);
|
||||
footballTeam.add(player3);
|
||||
|
||||
System.out.println("Before Sorting : " + footballTeam);
|
||||
//Instance of PlayerAgeComparator
|
||||
PlayerAgeComparator playerComparator = new PlayerAgeComparator();
|
||||
Collections.sort(footballTeam, playerComparator);
|
||||
System.out.println("After Sorting by age : " + footballTeam);
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,12 +0,0 @@
|
||||
package com.baeldung.comparator;
|
||||
|
||||
import java.util.Comparator;
|
||||
|
||||
public class PlayerRankingComparator implements Comparator<Player> {
|
||||
|
||||
@Override
|
||||
public int compare(Player firstPlayer, Player secondPlayer) {
|
||||
return (firstPlayer.getRanking() - secondPlayer.getRanking());
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,27 +0,0 @@
|
||||
package com.baeldung.comparator;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
public class PlayerRankingSorter {
|
||||
|
||||
public static void main(String[] args) {
|
||||
|
||||
List<Player> footballTeam = new ArrayList<Player>();
|
||||
Player player1 = new Player(59, "John", 22);
|
||||
Player player2 = new Player(67, "Roger", 20);
|
||||
Player player3 = new Player(45, "Steven", 40);
|
||||
footballTeam.add(player1);
|
||||
footballTeam.add(player2);
|
||||
footballTeam.add(player3);
|
||||
|
||||
System.out.println("Before Sorting : " + footballTeam);
|
||||
//Instance of PlayerRankingComparator
|
||||
PlayerRankingComparator playerComparator = new PlayerRankingComparator();
|
||||
Collections.sort(footballTeam, playerComparator);
|
||||
System.out.println("After Sorting by ranking : " + footballTeam);
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,19 +0,0 @@
|
||||
package com.baeldung.dynamicproxy;
|
||||
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.lang.reflect.InvocationHandler;
|
||||
import java.lang.reflect.Method;
|
||||
|
||||
public class DynamicInvocationHandler implements InvocationHandler {
|
||||
|
||||
private static Logger LOGGER = LoggerFactory.getLogger(DynamicInvocationHandler.class);
|
||||
|
||||
@Override
|
||||
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
|
||||
LOGGER.info("Invoked method: {}", method.getName());
|
||||
|
||||
return 42;
|
||||
}
|
||||
}
|
||||
@@ -1,36 +0,0 @@
|
||||
package com.baeldung.dynamicproxy;
|
||||
|
||||
import java.lang.reflect.InvocationHandler;
|
||||
import java.lang.reflect.Method;
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
public class TimingDynamicInvocationHandler implements InvocationHandler {
|
||||
|
||||
private static Logger LOGGER = LoggerFactory.getLogger(TimingDynamicInvocationHandler.class);
|
||||
private final Map<String, Method> methods = new HashMap<>();
|
||||
|
||||
private Object target;
|
||||
|
||||
TimingDynamicInvocationHandler(Object target) {
|
||||
this.target = target;
|
||||
|
||||
for(Method method: target.getClass().getDeclaredMethods()) {
|
||||
this.methods.put(method.getName(), method);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
|
||||
long start = System.nanoTime();
|
||||
Object result = methods.get(method.getName()).invoke(target, args);
|
||||
long elapsed = System.nanoTime() - start;
|
||||
|
||||
LOGGER.info("Executing {} finished in {} ns", method.getName(), elapsed);
|
||||
|
||||
return result;
|
||||
}
|
||||
}
|
||||
@@ -1,63 +0,0 @@
|
||||
package com.baeldung.equalshashcode.entities;
|
||||
|
||||
import java.util.List;
|
||||
import java.util.Set;
|
||||
|
||||
public class ComplexClass {
|
||||
|
||||
private List<?> genericList;
|
||||
private Set<Integer> integerSet;
|
||||
|
||||
public ComplexClass(List<?> genericArrayList, Set<Integer> integerHashSet) {
|
||||
super();
|
||||
this.genericList = genericArrayList;
|
||||
this.integerSet = integerHashSet;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = 1;
|
||||
result = prime * result + ((genericList == null) ? 0 : genericList.hashCode());
|
||||
result = prime * result + ((integerSet == null) ? 0 : integerSet.hashCode());
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj)
|
||||
return true;
|
||||
if (obj == null)
|
||||
return false;
|
||||
if (!(obj instanceof ComplexClass))
|
||||
return false;
|
||||
ComplexClass other = (ComplexClass) obj;
|
||||
if (genericList == null) {
|
||||
if (other.genericList != null)
|
||||
return false;
|
||||
} else if (!genericList.equals(other.genericList))
|
||||
return false;
|
||||
if (integerSet == null) {
|
||||
if (other.integerSet != null)
|
||||
return false;
|
||||
} else if (!integerSet.equals(other.integerSet))
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
protected List<?> getGenericList() {
|
||||
return genericList;
|
||||
}
|
||||
|
||||
protected void setGenericArrayList(List<?> genericList) {
|
||||
this.genericList = genericList;
|
||||
}
|
||||
|
||||
protected Set<Integer> getIntegerSet() {
|
||||
return integerSet;
|
||||
}
|
||||
|
||||
protected void setIntegerSet(Set<Integer> integerSet) {
|
||||
this.integerSet = integerSet;
|
||||
}
|
||||
}
|
||||
@@ -1,54 +0,0 @@
|
||||
package com.baeldung.equalshashcode.entities;
|
||||
|
||||
public class PrimitiveClass {
|
||||
|
||||
private boolean primitiveBoolean;
|
||||
private int primitiveInt;
|
||||
|
||||
public PrimitiveClass(boolean primitiveBoolean, int primitiveInt) {
|
||||
super();
|
||||
this.primitiveBoolean = primitiveBoolean;
|
||||
this.primitiveInt = primitiveInt;
|
||||
}
|
||||
|
||||
protected boolean isPrimitiveBoolean() {
|
||||
return primitiveBoolean;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = 1;
|
||||
result = prime * result + (primitiveBoolean ? 1231 : 1237);
|
||||
result = prime * result + primitiveInt;
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj)
|
||||
return true;
|
||||
if (obj == null)
|
||||
return false;
|
||||
if (getClass() != obj.getClass())
|
||||
return false;
|
||||
PrimitiveClass other = (PrimitiveClass) obj;
|
||||
if (primitiveBoolean != other.primitiveBoolean)
|
||||
return false;
|
||||
if (primitiveInt != other.primitiveInt)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
protected void setPrimitiveBoolean(boolean primitiveBoolean) {
|
||||
this.primitiveBoolean = primitiveBoolean;
|
||||
}
|
||||
|
||||
protected int getPrimitiveInt() {
|
||||
return primitiveInt;
|
||||
}
|
||||
|
||||
protected void setPrimitiveInt(int primitiveInt) {
|
||||
this.primitiveInt = primitiveInt;
|
||||
}
|
||||
}
|
||||
@@ -1,58 +0,0 @@
|
||||
package com.baeldung.equalshashcode.entities;
|
||||
|
||||
public class Rectangle extends Shape {
|
||||
private double width;
|
||||
private double length;
|
||||
|
||||
public Rectangle(double width, double length) {
|
||||
this.width = width;
|
||||
this.length = length;
|
||||
}
|
||||
|
||||
@Override
|
||||
public double area() {
|
||||
return width * length;
|
||||
}
|
||||
|
||||
@Override
|
||||
public double perimeter() {
|
||||
return 2 * (width + length);
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = 1;
|
||||
long temp;
|
||||
temp = Double.doubleToLongBits(length);
|
||||
result = prime * result + (int) (temp ^ (temp >>> 32));
|
||||
temp = Double.doubleToLongBits(width);
|
||||
result = prime * result + (int) (temp ^ (temp >>> 32));
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj)
|
||||
return true;
|
||||
if (obj == null)
|
||||
return false;
|
||||
if (getClass() != obj.getClass())
|
||||
return false;
|
||||
Rectangle other = (Rectangle) obj;
|
||||
if (Double.doubleToLongBits(length) != Double.doubleToLongBits(other.length))
|
||||
return false;
|
||||
if (Double.doubleToLongBits(width) != Double.doubleToLongBits(other.width))
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
protected double getWidth() {
|
||||
return width;
|
||||
}
|
||||
|
||||
protected double getLength() {
|
||||
return length;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,7 +0,0 @@
|
||||
package com.baeldung.equalshashcode.entities;
|
||||
|
||||
public abstract class Shape {
|
||||
public abstract double area();
|
||||
|
||||
public abstract double perimeter();
|
||||
}
|
||||
@@ -1,58 +0,0 @@
|
||||
package com.baeldung.equalshashcode.entities;
|
||||
|
||||
import java.awt.*;
|
||||
|
||||
public class Square extends Rectangle {
|
||||
|
||||
private Color color;
|
||||
|
||||
public Square(double width, Color color) {
|
||||
super(width, width);
|
||||
this.color = color;
|
||||
}
|
||||
|
||||
/* (non-Javadoc)
|
||||
* @see java.lang.Object#hashCode()
|
||||
*/
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = super.hashCode();
|
||||
result = prime * result + ((color == null) ? 0 : color.hashCode());
|
||||
return result;
|
||||
}
|
||||
|
||||
/* (non-Javadoc)
|
||||
* @see java.lang.Object#equals(java.lang.Object)
|
||||
*/
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj) {
|
||||
return true;
|
||||
}
|
||||
if (!super.equals(obj)) {
|
||||
return false;
|
||||
}
|
||||
if (!(obj instanceof Square)) {
|
||||
return false;
|
||||
}
|
||||
Square other = (Square) obj;
|
||||
if (color == null) {
|
||||
if (other.color != null) {
|
||||
return false;
|
||||
}
|
||||
} else if (!color.equals(other.color)) {
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
protected Color getColor() {
|
||||
return color;
|
||||
}
|
||||
|
||||
protected void setColor(Color color) {
|
||||
this.color = color;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,12 +0,0 @@
|
||||
package com.baeldung.generics;
|
||||
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
public class Building {
|
||||
private static final Logger LOGGER = LoggerFactory.getLogger(Building.class);
|
||||
|
||||
public void paint() {
|
||||
LOGGER.info("Painting Building");
|
||||
}
|
||||
}
|
||||
@@ -1,31 +0,0 @@
|
||||
package com.baeldung.generics;
|
||||
|
||||
import java.util.Arrays;
|
||||
import java.util.List;
|
||||
import java.util.function.Function;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
public class Generics {
|
||||
|
||||
// definition of a generic method
|
||||
public static <T> List<T> fromArrayToList(T[] a) {
|
||||
return Arrays.stream(a).collect(Collectors.toList());
|
||||
}
|
||||
|
||||
// definition of a generic method
|
||||
public static <T, G> List<G> fromArrayToList(T[] a, Function<T, G> mapperFunction) {
|
||||
return Arrays.stream(a).map(mapperFunction).collect(Collectors.toList());
|
||||
}
|
||||
|
||||
// example of a generic method that has Number as an upper bound for T
|
||||
public static <T extends Number> List<T> fromArrayToListWithUpperBound(T[] a) {
|
||||
return Arrays.stream(a).collect(Collectors.toList());
|
||||
}
|
||||
|
||||
// example of a generic method with a wild card, this method can be used
|
||||
// with a list of any subtype of Building
|
||||
public static void paintAllBuildings(List<? extends Building> buildings) {
|
||||
buildings.forEach(Building::paint);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,12 +0,0 @@
|
||||
package com.baeldung.generics;
|
||||
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
public class House extends Building {
|
||||
private static final Logger LOGGER = LoggerFactory.getLogger(House.class);
|
||||
|
||||
public void paint() {
|
||||
LOGGER.info("Painting House");
|
||||
}
|
||||
}
|
||||
@@ -1,42 +0,0 @@
|
||||
package com.baeldung.hashcode.entities;
|
||||
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
public class User {
|
||||
|
||||
private final Logger logger = LoggerFactory.getLogger(User.class);
|
||||
private long id;
|
||||
private String name;
|
||||
private String email;
|
||||
|
||||
public User(long id, String name, String email) {
|
||||
this.id = id;
|
||||
this.name = name;
|
||||
this.email = email;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object o) {
|
||||
if (this == o)
|
||||
return true;
|
||||
if (o == null)
|
||||
return false;
|
||||
if (this.getClass() != o.getClass())
|
||||
return false;
|
||||
User user = (User) o;
|
||||
return id == user.id && (name.equals(user.name) && email.equals(user.email));
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
int hash = 7;
|
||||
hash = 31 * hash + (int) id;
|
||||
hash = 31 * hash + (name == null ? 0 : name.hashCode());
|
||||
hash = 31 * hash + (email == null ? 0 : email.hashCode());
|
||||
logger.info("hashCode() method called - Computed hash: " + hash);
|
||||
return hash;
|
||||
}
|
||||
// getters and setters here
|
||||
|
||||
}
|
||||
@@ -1,53 +0,0 @@
|
||||
package com.baeldung.initializationguide;
|
||||
|
||||
import java.io.Serializable;
|
||||
|
||||
public class User implements Serializable, Cloneable {
|
||||
private static final long serialVersionUID = 1L;
|
||||
static String forum;
|
||||
private String name;
|
||||
private int id;
|
||||
|
||||
{
|
||||
id = 0;
|
||||
System.out.println("Instance Initializer");
|
||||
}
|
||||
|
||||
static {
|
||||
forum = "Java";
|
||||
System.out.println("Static Initializer");
|
||||
}
|
||||
|
||||
public User(String name, int id) {
|
||||
super();
|
||||
this.name = name;
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public User() {
|
||||
System.out.println("Constructor");
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public int getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(int id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
@Override
|
||||
protected Object clone() throws CloneNotSupportedException {
|
||||
return this;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@@ -1,31 +0,0 @@
|
||||
package com.baeldung.java.enumiteration;
|
||||
|
||||
import java.util.stream.Stream;
|
||||
|
||||
public enum DaysOfWeekEnum {
|
||||
SUNDAY("off"),
|
||||
MONDAY("working"),
|
||||
TUESDAY("working"),
|
||||
WEDNESDAY("working"),
|
||||
THURSDAY("working"),
|
||||
FRIDAY("working"),
|
||||
SATURDAY("off");
|
||||
|
||||
private String typeOfDay;
|
||||
|
||||
DaysOfWeekEnum(String typeOfDay) {
|
||||
this.typeOfDay = typeOfDay;
|
||||
}
|
||||
|
||||
public String getTypeOfDay() {
|
||||
return typeOfDay;
|
||||
}
|
||||
|
||||
public void setTypeOfDay(String typeOfDay) {
|
||||
this.typeOfDay = typeOfDay;
|
||||
}
|
||||
|
||||
public static Stream<DaysOfWeekEnum> stream() {
|
||||
return Stream.of(DaysOfWeekEnum.values());
|
||||
}
|
||||
}
|
||||
@@ -1,18 +0,0 @@
|
||||
package com.baeldung.java.enumiteration;
|
||||
|
||||
import java.util.EnumSet;
|
||||
|
||||
public class EnumIterationExamples {
|
||||
public static void main(String[] args) {
|
||||
System.out.println("Enum iteration using forEach:");
|
||||
EnumSet.allOf(DaysOfWeekEnum.class).forEach(day -> System.out.println(day));
|
||||
|
||||
System.out.println("Enum iteration using Stream:");
|
||||
DaysOfWeekEnum.stream().filter(d -> d.getTypeOfDay().equals("off")).forEach(System.out::println);
|
||||
|
||||
System.out.println("Enum iteration using for loop:");
|
||||
for (DaysOfWeekEnum day : DaysOfWeekEnum.values()) {
|
||||
System.out.println(day);
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -1,23 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
public abstract class Animal implements Eating {
|
||||
|
||||
public static final String CATEGORY = "domestic";
|
||||
|
||||
private String name;
|
||||
|
||||
public Animal(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
protected abstract String getSound();
|
||||
|
||||
}
|
||||
@@ -1,36 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
public class Bird extends Animal {
|
||||
private boolean walks;
|
||||
|
||||
public Bird() {
|
||||
super("bird");
|
||||
}
|
||||
|
||||
public Bird(String name, boolean walks) {
|
||||
super(name);
|
||||
setWalks(walks);
|
||||
}
|
||||
|
||||
public Bird(String name) {
|
||||
super(name);
|
||||
}
|
||||
|
||||
@Override
|
||||
public String eats() {
|
||||
return "grains";
|
||||
}
|
||||
|
||||
@Override
|
||||
protected String getSound() {
|
||||
return "chaps";
|
||||
}
|
||||
|
||||
public boolean walks() {
|
||||
return walks;
|
||||
}
|
||||
|
||||
public void setWalks(boolean walks) {
|
||||
this.walks = walks;
|
||||
}
|
||||
}
|
||||
@@ -1,23 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
import java.lang.annotation.Annotation;
|
||||
|
||||
public class DynamicGreeter implements Greeter {
|
||||
|
||||
private String greet;
|
||||
|
||||
public DynamicGreeter(String greet) {
|
||||
this.greet = greet;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Class<? extends Annotation> annotationType() {
|
||||
return DynamicGreeter.class;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String greet() {
|
||||
return greet;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,5 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
public interface Eating {
|
||||
String eats();
|
||||
}
|
||||
@@ -1,24 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
public class Goat extends Animal implements Locomotion {
|
||||
|
||||
public Goat(String name) {
|
||||
super(name);
|
||||
}
|
||||
|
||||
@Override
|
||||
protected String getSound() {
|
||||
return "bleat";
|
||||
}
|
||||
|
||||
@Override
|
||||
public String getLocomotion() {
|
||||
return "walks";
|
||||
}
|
||||
|
||||
@Override
|
||||
public String eats() {
|
||||
return "grass";
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,10 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
import java.lang.annotation.Retention;
|
||||
import java.lang.annotation.RetentionPolicy;
|
||||
|
||||
@Retention(RetentionPolicy.RUNTIME)
|
||||
public @interface Greeter {
|
||||
|
||||
public String greet() default "";
|
||||
}
|
||||
@@ -1,58 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
import java.lang.annotation.Annotation;
|
||||
import java.lang.reflect.Field;
|
||||
import java.lang.reflect.Method;
|
||||
import java.util.Map;
|
||||
|
||||
public class GreetingAnnotation {
|
||||
|
||||
private static final String ANNOTATION_METHOD = "annotationData";
|
||||
private static final String ANNOTATION_FIELDS = "declaredAnnotations";
|
||||
private static final String ANNOTATIONS = "annotations";
|
||||
|
||||
public static void main(String ...args) {
|
||||
Greeter greetings = Greetings.class.getAnnotation(Greeter.class);
|
||||
System.err.println("Hello there, " + greetings.greet() + " !!");
|
||||
|
||||
Greeter targetValue = new DynamicGreeter("Good evening");
|
||||
//alterAnnotationValueJDK8(Greetings.class, Greeter.class, targetValue);
|
||||
alterAnnotationValueJDK7(Greetings.class, Greeter.class, targetValue);
|
||||
|
||||
greetings = Greetings.class.getAnnotation(Greeter.class);
|
||||
System.err.println("Hello there, " + greetings.greet() + " !!");
|
||||
}
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
public static void alterAnnotationValueJDK8(Class<?> targetClass, Class<? extends Annotation> targetAnnotation, Annotation targetValue) {
|
||||
try {
|
||||
Method method = Class.class.getDeclaredMethod(ANNOTATION_METHOD, null);
|
||||
method.setAccessible(true);
|
||||
|
||||
Object annotationData = method.invoke(targetClass);
|
||||
|
||||
Field annotations = annotationData.getClass().getDeclaredField(ANNOTATIONS);
|
||||
annotations.setAccessible(true);
|
||||
|
||||
Map<Class<? extends Annotation>, Annotation> map = (Map<Class<? extends Annotation>, Annotation>) annotations.get(annotationData);
|
||||
map.put(targetAnnotation, targetValue);
|
||||
} catch (Exception e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
public static void alterAnnotationValueJDK7(Class<?> targetClass, Class<? extends Annotation> targetAnnotation, Annotation targetValue) {
|
||||
try {
|
||||
Field annotations = Class.class.getDeclaredField(ANNOTATIONS);
|
||||
annotations.setAccessible(true);
|
||||
|
||||
Map<Class<? extends Annotation>, Annotation> map = (Map<Class<? extends Annotation>, Annotation>) annotations.get(targetClass);
|
||||
System.out.println(map);
|
||||
map.put(targetAnnotation, targetValue);
|
||||
System.out.println(map);
|
||||
} catch (Exception e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -1,6 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
@Greeter(greet="Good morning")
|
||||
public class Greetings {
|
||||
|
||||
}
|
||||
@@ -1,5 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
public interface Locomotion {
|
||||
String getLocomotion();
|
||||
}
|
||||
@@ -1,21 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
public class Operations {
|
||||
|
||||
public double publicSum(int a, double b) {
|
||||
return a + b;
|
||||
}
|
||||
|
||||
public static double publicStaticMultiply(float a, long b) {
|
||||
return a * b;
|
||||
}
|
||||
|
||||
private boolean privateAnd(boolean a, boolean b) {
|
||||
return a && b;
|
||||
}
|
||||
|
||||
protected int protectedMax(int a, int b) {
|
||||
return a > b ? a : b;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,6 +0,0 @@
|
||||
package com.baeldung.java.reflection;
|
||||
|
||||
public class Person {
|
||||
private String name;
|
||||
private int age;
|
||||
}
|
||||
@@ -1,23 +0,0 @@
|
||||
package com.baeldung.loops;
|
||||
|
||||
public class InfiniteLoops {
|
||||
|
||||
public void infiniteLoopUsingWhile() {
|
||||
while (true) {
|
||||
System.out.println("Infinite loop using while");
|
||||
}
|
||||
}
|
||||
|
||||
public void infiniteLoopUsingFor() {
|
||||
for (;;) {
|
||||
System.out.println("Infinite loop using for");
|
||||
}
|
||||
}
|
||||
|
||||
public void infiniteLoopUsingDoWhile() {
|
||||
do {
|
||||
System.out.println("Infinite loop using do-while");
|
||||
} while (true);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,43 +0,0 @@
|
||||
package com.baeldung.loops;
|
||||
|
||||
public class LoopsInJava {
|
||||
|
||||
public int[] simple_for_loop() {
|
||||
int[] arr = new int[5];
|
||||
for (int i = 0; i < 5; i++) {
|
||||
arr[i] = i;
|
||||
System.out.println("Simple for loop: i - " + i);
|
||||
}
|
||||
return arr;
|
||||
}
|
||||
|
||||
public int[] enhanced_for_each_loop() {
|
||||
int[] intArr = { 0, 1, 2, 3, 4 };
|
||||
int[] arr = new int[5];
|
||||
for (int num : intArr) {
|
||||
arr[num] = num;
|
||||
System.out.println("Enhanced for-each loop: i - " + num);
|
||||
}
|
||||
return arr;
|
||||
}
|
||||
|
||||
public int[] while_loop() {
|
||||
int i = 0;
|
||||
int[] arr = new int[5];
|
||||
while (i < 5) {
|
||||
arr[i] = i;
|
||||
System.out.println("While loop: i - " + i++);
|
||||
}
|
||||
return arr;
|
||||
}
|
||||
|
||||
public int[] do_while_loop() {
|
||||
int i = 0;
|
||||
int[] arr = new int[5];
|
||||
do {
|
||||
arr[i] = i;
|
||||
System.out.println("Do-While loop: i - " + i++);
|
||||
} while (i < 5);
|
||||
return arr;
|
||||
}
|
||||
}
|
||||
@@ -1,48 +0,0 @@
|
||||
package com.baeldung.staticdemo;
|
||||
|
||||
/**
|
||||
* This class demonstrates the use of static fields and static methods
|
||||
* the instance variables engine and displacement are distinct for
|
||||
* each and every object whereas static/class variable numberOfCars
|
||||
* is unique and is shared across all objects of this class.
|
||||
*
|
||||
* @author baeldung
|
||||
*
|
||||
*/
|
||||
public class Car {
|
||||
private String name;
|
||||
private String engine;
|
||||
|
||||
public static int numberOfCars;
|
||||
|
||||
public Car(String name, String engine) {
|
||||
this.name = name;
|
||||
this.engine = engine;
|
||||
numberOfCars++;
|
||||
}
|
||||
|
||||
//getters and setters
|
||||
public static int getNumberOfCars() {
|
||||
return numberOfCars;
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public String getEngine() {
|
||||
return engine;
|
||||
}
|
||||
|
||||
public void setEngine(String engine) {
|
||||
this.engine = engine;
|
||||
}
|
||||
|
||||
public static void setNumberOfCars(int numberOfCars) {
|
||||
Car.numberOfCars = numberOfCars;
|
||||
}
|
||||
}
|
||||
@@ -1,13 +0,0 @@
|
||||
package com.baeldung.staticdemo;
|
||||
|
||||
public class Singleton {
|
||||
private Singleton() {}
|
||||
|
||||
private static class SingletonHolder {
|
||||
public static final Singleton instance = new Singleton();
|
||||
}
|
||||
|
||||
public static Singleton getInstance() {
|
||||
return SingletonHolder.instance;
|
||||
}
|
||||
}
|
||||
@@ -1,28 +0,0 @@
|
||||
package com.baeldung.staticdemo;
|
||||
|
||||
import java.util.LinkedList;
|
||||
import java.util.List;
|
||||
|
||||
public class StaticBlock {
|
||||
private static List<String> ranks = new LinkedList<>();
|
||||
|
||||
static {
|
||||
ranks.add("Lieutenant");
|
||||
ranks.add("Captain");
|
||||
ranks.add("Major");
|
||||
}
|
||||
|
||||
static {
|
||||
ranks.add("Colonel");
|
||||
ranks.add("General");
|
||||
}
|
||||
|
||||
//getters and setters
|
||||
public static List<String> getRanks() {
|
||||
return ranks;
|
||||
}
|
||||
|
||||
public static void setRanks(List<String> ranks) {
|
||||
StaticBlock.ranks = ranks;
|
||||
}
|
||||
}
|
||||
@@ -1,63 +0,0 @@
|
||||
package org.baeldung.equalshashcode.entities;
|
||||
|
||||
import java.util.List;
|
||||
import java.util.Set;
|
||||
|
||||
public class ComplexClass {
|
||||
|
||||
private List<?> genericList;
|
||||
private Set<Integer> integerSet;
|
||||
|
||||
public ComplexClass(List<?> genericArrayList, Set<Integer> integerHashSet) {
|
||||
super();
|
||||
this.genericList = genericArrayList;
|
||||
this.integerSet = integerHashSet;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = 1;
|
||||
result = prime * result + ((genericList == null) ? 0 : genericList.hashCode());
|
||||
result = prime * result + ((integerSet == null) ? 0 : integerSet.hashCode());
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj)
|
||||
return true;
|
||||
if (obj == null)
|
||||
return false;
|
||||
if (!(obj instanceof ComplexClass))
|
||||
return false;
|
||||
ComplexClass other = (ComplexClass) obj;
|
||||
if (genericList == null) {
|
||||
if (other.genericList != null)
|
||||
return false;
|
||||
} else if (!genericList.equals(other.genericList))
|
||||
return false;
|
||||
if (integerSet == null) {
|
||||
if (other.integerSet != null)
|
||||
return false;
|
||||
} else if (!integerSet.equals(other.integerSet))
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
protected List<?> getGenericList() {
|
||||
return genericList;
|
||||
}
|
||||
|
||||
protected void setGenericArrayList(List<?> genericList) {
|
||||
this.genericList = genericList;
|
||||
}
|
||||
|
||||
protected Set<Integer> getIntegerSet() {
|
||||
return integerSet;
|
||||
}
|
||||
|
||||
protected void setIntegerSet(Set<Integer> integerSet) {
|
||||
this.integerSet = integerSet;
|
||||
}
|
||||
}
|
||||
@@ -1,54 +0,0 @@
|
||||
package org.baeldung.equalshashcode.entities;
|
||||
|
||||
public class PrimitiveClass {
|
||||
|
||||
private boolean primitiveBoolean;
|
||||
private int primitiveInt;
|
||||
|
||||
public PrimitiveClass(boolean primitiveBoolean, int primitiveInt) {
|
||||
super();
|
||||
this.primitiveBoolean = primitiveBoolean;
|
||||
this.primitiveInt = primitiveInt;
|
||||
}
|
||||
|
||||
protected boolean isPrimitiveBoolean() {
|
||||
return primitiveBoolean;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = 1;
|
||||
result = prime * result + (primitiveBoolean ? 1231 : 1237);
|
||||
result = prime * result + primitiveInt;
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj)
|
||||
return true;
|
||||
if (obj == null)
|
||||
return false;
|
||||
if (getClass() != obj.getClass())
|
||||
return false;
|
||||
PrimitiveClass other = (PrimitiveClass) obj;
|
||||
if (primitiveBoolean != other.primitiveBoolean)
|
||||
return false;
|
||||
if (primitiveInt != other.primitiveInt)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
protected void setPrimitiveBoolean(boolean primitiveBoolean) {
|
||||
this.primitiveBoolean = primitiveBoolean;
|
||||
}
|
||||
|
||||
protected int getPrimitiveInt() {
|
||||
return primitiveInt;
|
||||
}
|
||||
|
||||
protected void setPrimitiveInt(int primitiveInt) {
|
||||
this.primitiveInt = primitiveInt;
|
||||
}
|
||||
}
|
||||
@@ -1,58 +0,0 @@
|
||||
package org.baeldung.equalshashcode.entities;
|
||||
|
||||
public class Rectangle extends Shape {
|
||||
private double width;
|
||||
private double length;
|
||||
|
||||
Rectangle(double width, double length) {
|
||||
this.width = width;
|
||||
this.length = length;
|
||||
}
|
||||
|
||||
@Override
|
||||
public double area() {
|
||||
return width * length;
|
||||
}
|
||||
|
||||
@Override
|
||||
public double perimeter() {
|
||||
return 2 * (width + length);
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = 1;
|
||||
long temp;
|
||||
temp = Double.doubleToLongBits(length);
|
||||
result = prime * result + (int) (temp ^ (temp >>> 32));
|
||||
temp = Double.doubleToLongBits(width);
|
||||
result = prime * result + (int) (temp ^ (temp >>> 32));
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj)
|
||||
return true;
|
||||
if (obj == null)
|
||||
return false;
|
||||
if (getClass() != obj.getClass())
|
||||
return false;
|
||||
Rectangle other = (Rectangle) obj;
|
||||
if (Double.doubleToLongBits(length) != Double.doubleToLongBits(other.length))
|
||||
return false;
|
||||
if (Double.doubleToLongBits(width) != Double.doubleToLongBits(other.width))
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
protected double getWidth() {
|
||||
return width;
|
||||
}
|
||||
|
||||
protected double getLength() {
|
||||
return length;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,7 +0,0 @@
|
||||
package org.baeldung.equalshashcode.entities;
|
||||
|
||||
public abstract class Shape {
|
||||
public abstract double area();
|
||||
|
||||
public abstract double perimeter();
|
||||
}
|
||||
@@ -1,58 +0,0 @@
|
||||
package org.baeldung.equalshashcode.entities;
|
||||
|
||||
import java.awt.Color;
|
||||
|
||||
public class Square extends Rectangle {
|
||||
|
||||
Color color;
|
||||
|
||||
public Square(double width, Color color) {
|
||||
super(width, width);
|
||||
this.color = color;
|
||||
}
|
||||
|
||||
/* (non-Javadoc)
|
||||
* @see java.lang.Object#hashCode()
|
||||
*/
|
||||
@Override
|
||||
public int hashCode() {
|
||||
final int prime = 31;
|
||||
int result = super.hashCode();
|
||||
result = prime * result + ((color == null) ? 0 : color.hashCode());
|
||||
return result;
|
||||
}
|
||||
|
||||
/* (non-Javadoc)
|
||||
* @see java.lang.Object#equals(java.lang.Object)
|
||||
*/
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
if (this == obj) {
|
||||
return true;
|
||||
}
|
||||
if (!super.equals(obj)) {
|
||||
return false;
|
||||
}
|
||||
if (!(obj instanceof Square)) {
|
||||
return false;
|
||||
}
|
||||
Square other = (Square) obj;
|
||||
if (color == null) {
|
||||
if (other.color != null) {
|
||||
return false;
|
||||
}
|
||||
} else if (!color.equals(other.color)) {
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
protected Color getColor() {
|
||||
return color;
|
||||
}
|
||||
|
||||
protected void setColor(Color color) {
|
||||
this.color = color;
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user