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Merge remote-tracking branch 'upstream/master' into craedel-enterprise-patterns/front-controller

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This commit is contained in:
Christian Rädel
2016-09-25 11:13:33 +02:00
parent 51c438b469 5b29f1bc81
commit 3b948c9b8b
239 changed files with 6802 additions and 3209 deletions
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core-java-9/.gitignore
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear
core-java-9/README.md
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=========
## Core Java 9 Examples
http://inprogress.baeldung.com/java-9-new-features/
core-java-9/pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java9</artifactId>
<version>0.2-SNAPSHOT</version>
<name>core-java9</name>
<pluginRepositories>
<pluginRepository>
<id>apache.snapshots</id>
<url>http://repository.apache.org/snapshots/</url>
</pluginRepository>
</pluginRepositories>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>${org.hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>${mockito.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>core-java-9</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.9</source>
<target>1.9</target>
<verbose>true</verbose>
<!-- <executable>C:\develop\jdks\jdk-9_ea122\bin\javac</executable>
<compilerVersion>1.9</compilerVersion> -->
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${maven-surefire-plugin.version}</version>
</plugin>
</plugins>
</build>
<properties>
<!-- logging -->
<org.slf4j.version>1.7.13</org.slf4j.version>
<logback.version>1.0.13</logback.version>
<!-- maven plugins -->
<!--
<maven-war-plugin.version>2.6</maven-war-plugin.version>
maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version> -->
<maven-compiler-plugin.version>3.6-jigsaw-SNAPSHOT</maven-compiler-plugin.version>
<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
<!-- testing -->
<org.hamcrest.version>1.3</org.hamcrest.version>
<junit.version>4.12</junit.version>
<mockito.version>1.10.19</mockito.version>
</properties>
</project>
core-java-9/src/main/java/.gitignore
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear
core-java-9/src/main/java/com/baeldung/java9/language/PrivateInterface.java
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package com.baeldung.java9.language;
public interface PrivateInterface {
private static String staticPrivate() {
return "static private";
}
private String instancePrivate() {
return "instance private";
}
public default void check(){
String result = staticPrivate();
if (!result.equals("static private"))
throw new AssertionError("Incorrect result for static private interface method");
PrivateInterface pvt = new PrivateInterface() {
};
result = pvt.instancePrivate();
if (!result.equals("instance private"))
throw new AssertionError("Incorrect result for instance private interface method");
}
}
core-java-9/src/main/java/com/baeldung/java9/process/ProcessUtils.java
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package com.baeldung.java9.process;
import java.io.File;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.time.Duration;
import java.time.Instant;
import java.util.stream.Stream;
public class ProcessUtils {
public static String getClassPath(){
String cp = System.getProperty("java.class.path");
System.out.println("ClassPath is "+cp);
return cp;
}
public static File getJavaCmd() throws IOException{
String javaHome = System.getProperty("java.home");
File javaCmd;
if(System.getProperty("os.name").startsWith("Win")){
javaCmd = new File(javaHome, "bin/java.exe");
}else{
javaCmd = new File(javaHome, "bin/java");
}
if(javaCmd.canExecute()){
return javaCmd;
}else{
throw new UnsupportedOperationException(javaCmd.getCanonicalPath() + " is not executable");
}
}
public static String getMainClass(){
return System.getProperty("sun.java.command");
}
public static String getSystemProperties(){
StringBuilder sb = new StringBuilder();
System.getProperties().forEach((s1, s2) -> sb.append(s1 +" - "+ s2) );
return sb.toString();
}
}
core-java-9/src/main/java/com/baeldung/java9/process/ServiceMain.java
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package com.baeldung.java9.process;
import java.util.Optional;
public class ServiceMain {
public static void main(String[] args) throws InterruptedException {
ProcessHandle thisProcess = ProcessHandle.current();
long pid = thisProcess.getPid();
Optional<String[]> opArgs = Optional.ofNullable(args);
String procName = opArgs.map(str -> str.length > 0 ? str[0] : null).orElse(System.getProperty("sun.java.command"));
for (int i = 0; i < 10000; i++) {
System.out.println("Process " + procName + " with ID " + pid + " is running!");
Thread.sleep(10000);
}
}
}
core-java-9/src/main/resources/logback.xml
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<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>web - %date [%thread] %-5level %logger{36} - %message%n
</pattern>
</encoder>
</appender>
<!-- <logger name="org.springframework" level="WARN" /> -->
<root level="INFO">
<appender-ref ref="STDOUT"/>
</root>
</configuration>
core-java-9/src/test/java/com/baeldung/java9/Java9OptionalsStreamTest.java
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package com.baeldung.java8;
import static org.junit.Assert.assertEquals;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.Before;
import org.junit.Test;
public class Java9OptionalsStreamTest {
private static List<Optional<String>> listOfOptionals = Arrays.asList(Optional.empty(), Optional.of("foo"), Optional.empty(), Optional.of("bar"));
@Test
public void filterOutPresentOptionalsWithFilter() {
assertEquals(4, listOfOptionals.size());
List<String> filteredList = listOfOptionals.stream()
.filter(Optional::isPresent)
.map(Optional::get)
.collect(Collectors.toList());
assertEquals(2, filteredList.size());
assertEquals("foo", filteredList.get(0));
assertEquals("bar", filteredList.get(1));
}
@Test
public void filterOutPresentOptionalsWithFlatMap() {
assertEquals(4, listOfOptionals.size());
List<String> filteredList = listOfOptionals.stream()
.flatMap(o -> o.isPresent() ? Stream.of(o.get()) : Stream.empty())
.collect(Collectors.toList());
assertEquals(2, filteredList.size());
assertEquals("foo", filteredList.get(0));
assertEquals("bar", filteredList.get(1));
}
@Test
public void filterOutPresentOptionalsWithJava9() {
assertEquals(4, listOfOptionals.size());
List<String> filteredList = listOfOptionals.stream()
.flatMap(Optional::stream)
.collect(Collectors.toList());
assertEquals(2, filteredList.size());
assertEquals("foo", filteredList.get(0));
assertEquals("bar", filteredList.get(1));
}
}
core-java-9/src/test/java/com/baeldung/java9/MultiResultionImageTest.java
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package com.baeldung.java9;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import java.awt.Image;
import java.awt.image.BaseMultiResolutionImage;
import java.awt.image.BufferedImage;
import java.awt.image.MultiResolutionImage;
import java.util.List;
import org.junit.Test;
public class MultiResultionImageTest {
@Test
public void baseMultiResImageTest() {
int baseIndex = 1;
int length = 4;
BufferedImage[] resolutionVariants = new BufferedImage[length];
for (int i = 0; i < length; i++) {
resolutionVariants[i] = createImage(i);
}
MultiResolutionImage bmrImage = new BaseMultiResolutionImage(baseIndex, resolutionVariants);
List<Image> rvImageList = bmrImage.getResolutionVariants();
assertEquals("MultiResoltion Image shoudl contain the same number of resolution variants!", rvImageList.size(), length);
for (int i = 0; i < length; i++) {
int imageSize = getSize(i);
Image testRVImage = bmrImage.getResolutionVariant(imageSize, imageSize);
assertSame("Images should be the same", testRVImage, resolutionVariants[i]);
}
}
private static int getSize(int i) {
return 8 * (i + 1);
}
private static BufferedImage createImage(int i) {
return new BufferedImage(getSize(i), getSize(i),
BufferedImage.TYPE_INT_RGB);
}
}
core-java-9/src/test/java/com/baeldung/java9/httpclient/SimpleHttpRequestsTest.java
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package com.baeldung.java9.httpclient;
import static java.net.HttpURLConnection.HTTP_OK;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpHeaders;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLParameters;
import org.junit.Before;
import org.junit.Test;
public class SimpleHttpRequestsTest {
private URI httpURI;
@Before
public void init() throws URISyntaxException {
httpURI = new URI("http://www.baeldung.com/");
}
@Test
public void quickGet() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.create( httpURI ).GET();
HttpResponse response = request.response();
int responseStatusCode = response.statusCode();
String responseBody = response.body(HttpResponse.asString());
assertTrue("Get response status code is bigger then 400", responseStatusCode < 400);
}
@Test
public void asynchronousGet() throws URISyntaxException, IOException, InterruptedException, ExecutionException{
HttpRequest request = HttpRequest.create(httpURI).GET();
long before = System.currentTimeMillis();
CompletableFuture<HttpResponse> futureResponse = request.responseAsync();
futureResponse.thenAccept( response -> {
String responseBody = response.body(HttpResponse.asString());
});
HttpResponse resp = futureResponse.get();
HttpHeaders hs = resp.headers();
assertTrue("There should be more then 1 header.", hs.map().size() >1);
}
@Test
public void postMehtod() throws URISyntaxException, IOException, InterruptedException {
HttpRequest.Builder requestBuilder = HttpRequest.create(httpURI);
requestBuilder.body(HttpRequest.fromString("param1=foo,param2=bar")).followRedirects(HttpClient.Redirect.SECURE);
HttpRequest request = requestBuilder.POST();
HttpResponse response = request.response();
int statusCode = response.statusCode();
assertTrue("HTTP return code", statusCode == HTTP_OK);
}
@Test
public void configureHttpClient() throws NoSuchAlgorithmException, URISyntaxException, IOException, InterruptedException{
CookieManager cManager = new CookieManager();
cManager.setCookiePolicy(CookiePolicy.ACCEPT_ORIGINAL_SERVER);
SSLParameters sslParam = new SSLParameters (new String[] { "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256" }, new String[] { "TLSv1.2" });
HttpClient.Builder hcBuilder = HttpClient.create();
hcBuilder.cookieManager(cManager).sslContext(SSLContext.getDefault()).sslParameters(sslParam);
HttpClient httpClient = hcBuilder.build();
HttpRequest.Builder reqBuilder = httpClient.request(new URI("https://www.facebook.com"));
HttpRequest request = reqBuilder.followRedirects(HttpClient.Redirect.ALWAYS).GET();
HttpResponse response = request.response();
int statusCode = response.statusCode();
assertTrue("HTTP return code", statusCode == HTTP_OK);
}
SSLParameters getDefaultSSLParameters() throws NoSuchAlgorithmException{
SSLParameters sslP1 = SSLContext.getDefault().getSupportedSSLParameters();
String [] proto = sslP1.getApplicationProtocols();
String [] cifers = sslP1.getCipherSuites();
System.out.println(printStringArr(proto));
System.out.println(printStringArr(cifers));
return sslP1;
}
String printStringArr(String ... args ){
if(args == null){
return null;
}
StringBuilder sb = new StringBuilder();
for (String s : args){
sb.append(s);
sb.append("\n");
}
return sb.toString();
}
String printHeaders(HttpHeaders h){
if(h == null){
return null;
}
StringBuilder sb = new StringBuilder();
Map<String, List<String>> hMap = h.map();
for(String k : hMap.keySet()){
sb.append(k).append(":");
List<String> l = hMap.get(k);
if( l != null ){
l.forEach( s -> { sb.append(s).append(","); } );
}
sb.append("\n");
}
return sb.toString();
}
}
core-java-9/src/test/java/com/baeldung/java9/language/DiamondTest.java
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package com.baeldung.java9.language;
import org.junit.Test;
public class DiamondTest {
static class FooClass<X> {
FooClass(X x) {
}
<Z> FooClass(X x, Z z) {
}
}
@Test
public void diamondTest() {
FooClass<Integer> fc = new FooClass<>(1) {
};
FooClass<? extends Integer> fc0 = new FooClass<>(1) {
};
FooClass<?> fc1 = new FooClass<>(1) {
};
FooClass<? super Integer> fc2 = new FooClass<>(1) {
};
FooClass<Integer> fc3 = new FooClass<>(1, "") {
};
FooClass<? extends Integer> fc4 = new FooClass<>(1, "") {
};
FooClass<?> fc5 = new FooClass<>(1, "") {
};
FooClass<? super Integer> fc6 = new FooClass<>(1, "") {
};
}
}
core-java-9/src/test/java/com/baeldung/java9/language/PrivateInterfaceTest.java
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package com.baeldung.java9.language;
import com.baeldung.java9.language.PrivateInterface;
import org.junit.Test;
public class PrivateInterfaceTest {
@Test
public void test() {
PrivateInterface piClass = new PrivateInterface() {
};
piClass.check();
}
}
core-java-9/src/test/java/com/baeldung/java9/language/TryWithResourcesTest.java
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package com.baeldung.java9.language;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class TryWithResourcesTest {
static int closeCount = 0;
static class MyAutoCloseable implements AutoCloseable{
final FinalWrapper finalWrapper = new FinalWrapper();
public void close() {
closeCount++;
}
static class FinalWrapper {
public final AutoCloseable finalCloseable = new AutoCloseable() {
@Override
public void close() throws Exception {
closeCount++;
}
};
}
}
@Test
public void tryWithResourcesTest() {
MyAutoCloseable mac = new MyAutoCloseable();
try (mac) {
assertEquals("Expected and Actual does not match", 0, closeCount);
}
try (mac.finalWrapper.finalCloseable) {
assertEquals("Expected and Actual does not match", 1, closeCount);
} catch (Exception ex) {
}
try (new MyAutoCloseable() { }.finalWrapper.finalCloseable) {
assertEquals("Expected and Actual does not match", 2, closeCount);
} catch (Exception ex) {
}
try ((closeCount > 0 ? mac : new MyAutoCloseable()).finalWrapper.finalCloseable) {
assertEquals("Expected and Actual does not match", 3, closeCount);
} catch (Exception ex) {
}
try {
throw new CloseableException();
} catch (CloseableException ex) {
try (ex) {
assertEquals("Expected and Actual does not match", 4, closeCount);
}
}
assertEquals("Expected and Actual does not match", 5, closeCount);
}
static class CloseableException extends Exception implements AutoCloseable {
@Override
public void close() {
closeCount++;
}
}
}
core-java-9/src/test/java/com/baeldung/java9/process/ProcessApi.java
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package com.baeldung.java9.process;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Stream;
import org.junit.Before;
import org.junit.Test;
import junit.framework.Assert;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
public class ProcessApi {
@Before
public void init() {
}
@Test
public void processInfoExample()throws NoSuchAlgorithmException{
ProcessHandle self = ProcessHandle.current();
long PID = self.getPid();
ProcessHandle.Info procInfo = self.info();
Optional<String[]> args = procInfo.arguments();
Optional<String> cmd = procInfo.commandLine();
Optional<Instant> startTime = procInfo.startInstant();
Optional<Duration> cpuUsage = procInfo.totalCpuDuration();
waistCPU();
System.out.println("Args "+ args);
System.out.println("Command " +cmd.orElse("EmptyCmd"));
System.out.println("Start time: "+ startTime.get().toString());
System.out.println(cpuUsage.get().toMillis());
Stream<ProcessHandle> allProc = ProcessHandle.current().children();
allProc.forEach(p -> {
System.out.println("Proc "+ p.getPid());
});
}
@Test
public void createAndDestroyProcess() throws IOException, InterruptedException{
int numberOfChildProcesses = 5;
for(int i=0; i < numberOfChildProcesses; i++){
createNewJVM(ServiceMain.class, i).getPid();
}
Stream<ProcessHandle> childProc = ProcessHandle.current().children();
assertEquals( childProc.count(), numberOfChildProcesses);
childProc = ProcessHandle.current().children();
childProc.forEach(processHandle -> {
assertTrue("Process "+ processHandle.getPid() +" should be alive!", processHandle.isAlive());
CompletableFuture<ProcessHandle> onProcExit = processHandle.onExit();
onProcExit.thenAccept(procHandle -> {
System.out.println("Process with PID "+ procHandle.getPid() + " has stopped");
});
});
Thread.sleep(10000);
childProc = ProcessHandle.current().children();
childProc.forEach(procHandle -> {
assertTrue("Could not kill process "+procHandle.getPid(), procHandle.destroy());
});
Thread.sleep(5000);
childProc = ProcessHandle.current().children();
childProc.forEach(procHandle -> {
assertFalse("Process "+ procHandle.getPid() +" should not be alive!", procHandle.isAlive());
});
}
private Process createNewJVM(Class mainClass, int number) throws IOException{
ArrayList<String> cmdParams = new ArrayList<String>(5);
cmdParams.add(ProcessUtils.getJavaCmd().getAbsolutePath());
cmdParams.add("-cp");
cmdParams.add(ProcessUtils.getClassPath());
cmdParams.add(mainClass.getName());
cmdParams.add("Service "+ number);
ProcessBuilder myService = new ProcessBuilder(cmdParams);
myService.inheritIO();
return myService.start();
}
private void waistCPU() throws NoSuchAlgorithmException{
ArrayList<Integer> randArr = new ArrayList<Integer>(4096);
SecureRandom sr = SecureRandom.getInstanceStrong();
Duration somecpu = Duration.ofMillis(4200L);
Instant end = Instant.now().plus(somecpu);
while (Instant.now().isBefore(end)) {
//System.out.println(sr.nextInt());
randArr.add( sr.nextInt() );
}
}
}
core-java-9/src/test/resources/.gitignore
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear
core-java/src/main/java/com/baeldung/java/reflection/Animal.java
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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();
}
core-java/src/main/java/com/baeldung/java/reflection/Bird.java
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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;
}
}
core-java/src/main/java/com/baeldung/java/reflection/Eating.java
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package com.baeldung.java.reflection;
public interface Eating {
String eats();
}
core-java/src/main/java/com/baeldung/java/reflection/Goat.java
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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";
}
}
core-java/src/main/java/com/baeldung/java/reflection/Locomotion.java
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package com.baeldung.java.reflection;
public interface Locomotion {
String getLocomotion();
}
core-java/src/main/java/com/baeldung/java/reflection/Person.java
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package com.baeldung.java.reflection;
public class Person {
private String name;
private int age;
}
core-java/src/test/java/com/baeldung/java/reflection/ReflectionTest.java
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core-java/src/test/java/org/baeldung/java/collections/ArrayListTest.java
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package org.baeldung.java.collections;
import com.google.common.collect.Sets;
import org.junit.Before;
import org.junit.Test;
import java.util.*;
import java.util.stream.*;
import static java.util.stream.Collectors.*;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.*;
public class ArrayListTest {
List<String> stringsToSearch;
private List<String> stringsToSearch;
@Before
public void setUp() {
List<String> xs = LongStream.range(0, 16)
.boxed()
.map(Long::toHexString)
.collect(Collectors.toList());
stringsToSearch = new ArrayList<>(xs);
stringsToSearch.addAll(xs);
List<String> list = LongStream.range(0, 16)
.boxed()
.map(Long::toHexString)
.collect(toCollection(ArrayList::new));
stringsToSearch = new ArrayList<>(list);
stringsToSearch.addAll(list);
}
@Test
public void givenNewArrayList_whenCheckCapacity_thenDefaultValue() {
List<String> xs = new ArrayList<>();
assertTrue(xs.isEmpty());
List<String> list = new ArrayList<>();
assertTrue(list.isEmpty());
}
@Test
public void givenCollection_whenProvideItToArrayListCtor_thenArrayListIsPopulatedWithItsElements() {
Collection<Integer> numbers =
IntStream.range(0, 10).boxed().collect(Collectors.toSet());
IntStream.range(0, 10).boxed().collect(toSet());
List<Integer> xs = new ArrayList<>(numbers);
assertEquals(10, xs.size());
assertTrue(numbers.containsAll(xs));
List<Integer> list = new ArrayList<>(numbers);
assertEquals(10, list.size());
assertTrue(numbers.containsAll(list));
}
@Test
public void givenElement_whenAddToArrayList_thenIsAdded() {
List<Long> xs = new ArrayList<>();
List<Long> list = new ArrayList<>();
xs.add(1L);
xs.add(2L);
xs.add(1, 3L);
list.add(1L);
list.add(2L);
list.add(1, 3L);
assertThat(Arrays.asList(1L, 3L, 2L), equalTo(xs));
assertThat(Arrays.asList(1L, 3L, 2L), equalTo(list));
}
@Test
public void givenCollection_whenAddToArrayList_thenIsAdded() {
List<Long> xs = new ArrayList<>(Arrays.asList(1L, 2L, 3L));
Collection<Long> ys = LongStream.range(4, 10).boxed().collect(Collectors.toList());
xs.addAll(0, ys);
List<Long> list = new ArrayList<>(Arrays.asList(1L, 2L, 3L));
LongStream.range(4, 10).boxed()
.collect(collectingAndThen(toCollection(ArrayList::new), ys -> list.addAll(0, ys)));
assertThat(Arrays.asList(4L, 5L, 6L, 7L, 8L, 9L, 1L, 2L, 3L), equalTo(xs));
assertThat(Arrays.asList(4L, 5L, 6L, 7L, 8L, 9L, 1L, 2L, 3L), equalTo(list));
}
@Test
@@ -87,9 +89,9 @@ public class ArrayListTest {
Set<String> matchingStrings = new HashSet<>(Arrays.asList("a", "c", "9"));
List<String> result = stringsToSearch
.stream()
.filter(matchingStrings::contains)
.collect(Collectors.toList());
.stream()
.filter(matchingStrings::contains)
.collect(toCollection(ArrayList::new));
assertEquals(6, result.size());
}
@@ -104,37 +106,33 @@ public class ArrayListTest {
@Test
public void givenIndex_whenRemove_thenCorrectElementRemoved() {
List<Integer> xs = new ArrayList<>(
IntStream.range(0, 10).boxed().collect(Collectors.toList())
);
Collections.reverse(xs);
List<Integer> list = IntStream.range(0, 10).boxed().collect(toCollection(ArrayList::new));
Collections.reverse(list);
xs.remove(0);
assertThat(xs.get(0), equalTo(8));
list.remove(0);
assertThat(list.get(0), equalTo(8));
xs.remove(Integer.valueOf(0));
assertFalse(xs.contains(0));
list.remove(Integer.valueOf(0));
assertFalse(list.contains(0));
}
@Test
public void givenListIterator_whenReverseTraversal_thenRetrieveElementsInOppositeOrder() {
List<Integer> xs = new ArrayList<>(
IntStream.range(0, 10).boxed().collect(Collectors.toList())
);
ListIterator<Integer> it = xs.listIterator(xs.size());
List<Integer> result = new ArrayList<>(xs.size());
List<Integer> list = IntStream.range(0, 10).boxed().collect(toCollection(ArrayList::new));
ListIterator<Integer> it = list.listIterator(list.size());
List<Integer> result = new ArrayList<>(list.size());
while (it.hasPrevious()) {
result.add(it.previous());
}
Collections.reverse(xs);
assertThat(result, equalTo(xs));
Collections.reverse(list);
assertThat(result, equalTo(list));
}
@Test
public void givenCondition_whenIterateArrayList_thenRemoveAllElementsSatisfyingCondition() {
Set<String> matchingStrings
= new HashSet<>(Arrays.asList("a", "b", "c", "d", "e", "f"));
= Sets.newHashSet("a", "b", "c", "d", "e", "f");
Iterator<String> it = stringsToSearch.iterator();
while (it.hasNext()) {
eclipse/src/main/java/org/baeldung/equalshashcode/entities/ComplexClass.java
+48 -52
View File
@@ -5,63 +5,59 @@ import java.util.HashSet;
public class ComplexClass {
private ArrayList<?> genericArrayList;
private HashSet<Integer> integerHashSet;
private ArrayList<?> genericArrayList;
private HashSet<Integer> integerHashSet;
public ComplexClass(ArrayList<?> genericArrayList,
HashSet<Integer> integerHashSet) {
super();
this.genericArrayList = genericArrayList;
this.integerHashSet = integerHashSet;
}
public ComplexClass(ArrayList<?> genericArrayList, HashSet<Integer> integerHashSet) {
super();
this.genericArrayList = genericArrayList;
this.integerHashSet = integerHashSet;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime
* result
+ ((genericArrayList == null) ? 0 : genericArrayList.hashCode());
result = prime * result
+ ((integerHashSet == null) ? 0 : integerHashSet.hashCode());
return result;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((genericArrayList == null) ? 0 : genericArrayList.hashCode());
result = prime * result + ((integerHashSet == null) ? 0 : integerHashSet.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 (genericArrayList == null) {
if (other.genericArrayList != null)
return false;
} else if (!genericArrayList.equals(other.genericArrayList))
return false;
if (integerHashSet == null) {
if (other.integerHashSet != null)
return false;
} else if (!integerHashSet.equals(other.integerHashSet))
return false;
return true;
}
@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 (genericArrayList == null) {
if (other.genericArrayList != null)
return false;
} else if (!genericArrayList.equals(other.genericArrayList))
return false;
if (integerHashSet == null) {
if (other.integerHashSet != null)
return false;
} else if (!integerHashSet.equals(other.integerHashSet))
return false;
return true;
}
protected ArrayList<?> getGenericArrayList() {
return genericArrayList;
}
protected ArrayList<?> getGenericArrayList() {
return genericArrayList;
}
protected void setGenericArrayList(ArrayList<?> genericArrayList) {
this.genericArrayList = genericArrayList;
}
protected void setGenericArrayList(ArrayList<?> genericArrayList) {
this.genericArrayList = genericArrayList;
}
protected HashSet<Integer> getIntegerHashSet() {
return integerHashSet;
}
protected HashSet<Integer> getIntegerHashSet() {
return integerHashSet;
}
protected void setIntegerHashSet(HashSet<Integer> integerHashSet) {
this.integerHashSet = integerHashSet;
}
protected void setIntegerHashSet(HashSet<Integer> integerHashSet) {
this.integerHashSet = integerHashSet;
}
}
eclipse/src/main/java/org/baeldung/equalshashcode/entities/PrimitiveClass.java
+42 -42
View File
@@ -2,53 +2,53 @@ package org.baeldung.equalshashcode.entities;
public class PrimitiveClass {
private boolean primitiveBoolean;
private int primitiveInt;
private boolean primitiveBoolean;
private int primitiveInt;
public PrimitiveClass(boolean primitiveBoolean, int primitiveInt) {
super();
this.primitiveBoolean = primitiveBoolean;
this.primitiveInt = primitiveInt;
}
public PrimitiveClass(boolean primitiveBoolean, int primitiveInt) {
super();
this.primitiveBoolean = primitiveBoolean;
this.primitiveInt = primitiveInt;
}
protected boolean isPrimitiveBoolean() {
return primitiveBoolean;
}
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 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;
}
@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 void setPrimitiveBoolean(boolean primitiveBoolean) {
this.primitiveBoolean = primitiveBoolean;
}
protected int getPrimitiveInt() {
return primitiveInt;
}
protected int getPrimitiveInt() {
return primitiveInt;
}
protected void setPrimitiveInt(int primitiveInt) {
this.primitiveInt = primitiveInt;
}
protected void setPrimitiveInt(int primitiveInt) {
this.primitiveInt = primitiveInt;
}
}
eclipse/src/main/java/org/baeldung/equalshashcode/entities/Rectangle.java
+48 -50
View File
@@ -1,62 +1,60 @@
package org.baeldung.equalshashcode.entities;
public class Rectangle extends Shape {
private double width;
private double length;
private double width;
private double length;
public Rectangle(double width, double length) {
this.width = width;
this.length = length;
}
public Rectangle(double width, double length) {
this.width = width;
this.length = length;
}
@Override
public double area() {
// A = w * l
return width * length;
}
@Override
public double area() {
// A = w * l
return width * length;
}
@Override
public double perimeter() {
// P = 2(w + l)
return 2 * (width + length);
}
@Override
public double perimeter() {
// P = 2(w + l)
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 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;
}
@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 getWidth() {
return width;
}
protected double getLength() {
return length;
}
protected double getLength() {
return length;
}
}
eclipse/src/main/java/org/baeldung/equalshashcode/entities/Shape.java
+2 -2
View File
@@ -1,7 +1,7 @@
package org.baeldung.equalshashcode.entities;
public abstract class Shape {
public abstract double area();
public abstract double area();
public abstract double perimeter();
public abstract double perimeter();
}
eclipse/src/main/java/org/baeldung/equalshashcode/entities/Square.java
+45 -34
View File
@@ -4,44 +4,55 @@ import java.awt.Color;
public class Square extends Rectangle {
Color color;
Color color;
public Square(double width, Color color) {
super(width, width);
this.color = color;
}
public Square(double width, Color color) {
super(width, width);
this.color = color;
}
@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#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = super.hashCode();
result = prime * result + ((color == null) ? 0 : color.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!super.equals(obj))
return false;
if (getClass() != obj.getClass())
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;
}
/* (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 Color getColor() {
return color;
}
protected void setColor(Color color) {
this.color = color;
}
protected void setColor(Color color) {
this.color = color;
}
}
eclipse/src/test/java/org/baeldung/equalshashcode/entities/ComplexClassTest.java
+22 -27
View File
@@ -8,32 +8,27 @@ import org.junit.Test;
public class ComplexClassTest {
@Test
public void testEqualsAndHashcodes() {
ArrayList<String> strArrayList = new ArrayList<String>();
strArrayList.add("abc");
strArrayList.add("def");
ComplexClass aObject = new ComplexClass(strArrayList, new HashSet<Integer>(45,67));
ComplexClass bObject = new ComplexClass(strArrayList, new HashSet<Integer>(45,67));
ComplexClass cObject = new ComplexClass(strArrayList, new HashSet<Integer>(45,67));
ArrayList<String> strArrayListD = new ArrayList<String>();
strArrayListD.add("lmn");
strArrayListD.add("pqr");
ComplexClass dObject = new ComplexClass(strArrayListD, new HashSet<Integer>(45,67));
// equals()
Assert.assertTrue(aObject.equals(aObject));
Assert.assertTrue(aObject.equals(bObject) && bObject.equals(aObject));
Assert.assertTrue(aObject.equals(bObject));
Assert.assertTrue(bObject.equals(cObject));
Assert.assertTrue(aObject.equals(cObject));
// hashCode()
Assert.assertTrue(aObject.hashCode() == bObject.hashCode());
// non-equal objects are not equals() and have different hashCode()
Assert.assertFalse(aObject.equals(dObject));
Assert.assertFalse(aObject.hashCode() == dObject.hashCode());
}
@Test
public void testEqualsAndHashcodes() {
ArrayList<String> strArrayList = new ArrayList<String>();
strArrayList.add("abc");
strArrayList.add("def");
ComplexClass aObject = new ComplexClass(strArrayList, new HashSet<Integer>(45, 67));
ComplexClass bObject = new ComplexClass(strArrayList, new HashSet<Integer>(45, 67));
ArrayList<String> strArrayListD = new ArrayList<String>();
strArrayListD.add("lmn");
strArrayListD.add("pqr");
ComplexClass dObject = new ComplexClass(strArrayListD, new HashSet<Integer>(45, 67));
// equals()
Assert.assertTrue(aObject.equals(bObject) && bObject.equals(aObject));
// hashCode()
Assert.assertTrue(aObject.hashCode() == bObject.hashCode());
// non-equal objects are not equals() and have different hashCode()
Assert.assertFalse(aObject.equals(dObject));
Assert.assertFalse(aObject.hashCode() == dObject.hashCode());
}
}

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