Merge pull request #5971 from amit2103/BAEL-10839
[BAEL-10839] - Create core-java-lang-oop module
This commit is contained in:
Loredana Crusoveanu
@@ -1,9 +0,0 @@
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package com.baeldung.accessmodifiers;
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public class Public {
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public Public() {
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SuperPublic.publicMethod(); // Available everywhere.
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SuperPublic.protectedMethod(); // Available in the same package or subclass.
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SuperPublic.defaultMethod(); // Available in the same package.
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}
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}
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@@ -1,9 +0,0 @@
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package com.baeldung.accessmodifiers;
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public class SubClass extends SuperPublic {
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public SubClass() {
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SuperPublic.publicMethod(); // Available everywhere.
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SuperPublic.protectedMethod(); // Available in the same package or subclass.
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SuperPublic.defaultMethod(); // Available in the same package.
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}
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}
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@@ -1,39 +0,0 @@
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package com.baeldung.accessmodifiers;
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//Only public or default access modifiers are permitted
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public class SuperPublic {
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// Always available from anywhere
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static public void publicMethod() {
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System.out.println(SuperPublic.class.getName() + " publicMethod()");
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}
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// Available within the same package
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static void defaultMethod() {
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System.out.println(SuperPublic.class.getName() + " defaultMethod()");
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}
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// Available within the same package and subclasses
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static protected void protectedMethod() {
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System.out.println(SuperPublic.class.getName() + " protectedMethod()");
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}
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// Available within the same class only
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static private void privateMethod() {
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System.out.println(SuperPublic.class.getName() + " privateMethod()");
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}
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// Method in the same class = has access to all members within the same class
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private void anotherPrivateMethod() {
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privateMethod();
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defaultMethod();
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protectedMethod();
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publicMethod(); // Available in the same class only.
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}
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}
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// Only public or default access modifiers are permitted
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class SuperDefault {
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public void publicMethod() {
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System.out.println(this.getClass().getName() + " publicMethod()");
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}
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}
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@@ -1,9 +0,0 @@
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package com.baeldung.accessmodifiers.another;
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import com.baeldung.accessmodifiers.SuperPublic;
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public class AnotherPublic {
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public AnotherPublic() {
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SuperPublic.publicMethod(); // Available everywhere.
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}
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}
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-10
@@ -1,10 +0,0 @@
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package com.baeldung.accessmodifiers.another;
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import com.baeldung.accessmodifiers.SuperPublic;
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public class AnotherSubClass extends SuperPublic {
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public AnotherSubClass() {
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SuperPublic.publicMethod(); // Available everywhere.
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SuperPublic.protectedMethod(); // Available in subclass. Let's note different package.
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}
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}
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-9
@@ -1,9 +0,0 @@
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package com.baeldung.accessmodifiers.another;
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import com.baeldung.accessmodifiers.SuperPublic;
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public class AnotherSuperPublic {
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public AnotherSuperPublic() {
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SuperPublic.publicMethod(); // Available everywhere. Let's note different package.
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}
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}
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@@ -1,13 +0,0 @@
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package com.baeldung.casting;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Animal {
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private static final Logger LOGGER = LoggerFactory.getLogger(Animal.class);
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public void eat() {
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LOGGER.info("animal is eating");
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}
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}
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@@ -1,23 +0,0 @@
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package com.baeldung.casting;
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import java.util.List;
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public class AnimalFeeder {
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public void feed(List<Animal> animals) {
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animals.forEach(animal -> {
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animal.eat();
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if (animal instanceof Cat) {
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((Cat) animal).meow();
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}
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});
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}
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public void uncheckedFeed(List<Animal> animals) {
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animals.forEach(animal -> {
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animal.eat();
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((Cat) animal).meow();
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});
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}
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}
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@@ -1,24 +0,0 @@
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package com.baeldung.casting;
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import java.util.ArrayList;
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import java.util.List;
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public class AnimalFeederGeneric<T> {
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private Class<T> type;
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public AnimalFeederGeneric(Class<T> type) {
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this.type = type;
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}
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public List<T> feed(List<Animal> animals) {
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List<T> list = new ArrayList<T>();
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animals.forEach(animal -> {
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if (type.isInstance(animal)) {
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T objAsType = type.cast(animal);
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list.add(objAsType);
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}
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});
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return list;
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}
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}
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@@ -1,16 +0,0 @@
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package com.baeldung.casting;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Cat extends Animal implements Mew {
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private static final Logger LOGGER = LoggerFactory.getLogger(Cat.class);
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public void eat() {
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LOGGER.info("cat is eating");
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}
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public void meow() {
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LOGGER.info("meow");
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}
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}
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@@ -1,12 +0,0 @@
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package com.baeldung.casting;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Dog extends Animal {
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private static final Logger LOGGER = LoggerFactory.getLogger(Dog.class);
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public void eat() {
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LOGGER.info("dog is eating");
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}
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}
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@@ -1,5 +0,0 @@
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package com.baeldung.casting;
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public interface Mew {
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public void meow();
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}
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@@ -1,56 +0,0 @@
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package com.baeldung.constructors;
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import java.time.LocalDateTime;
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class BankAccount {
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String name;
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LocalDateTime opened;
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double balance;
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@Override
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public String toString() {
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return String.format("%s, %s, %f", this.name, this.opened.toString(), this.balance);
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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 LocalDateTime getOpened() {
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return opened;
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}
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public double getBalance() {
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return this.balance;
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}
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}
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class BankAccountEmptyConstructor extends BankAccount {
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public BankAccountEmptyConstructor() {
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this.name = "";
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this.opened = LocalDateTime.now();
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this.balance = 0.0d;
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}
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}
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class BankAccountParameterizedConstructor extends BankAccount {
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public BankAccountParameterizedConstructor(String name, LocalDateTime opened, double balance) {
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this.name = name;
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this.opened = opened;
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this.balance = balance;
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}
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}
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class BankAccountCopyConstructor extends BankAccount {
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public BankAccountCopyConstructor(String name, LocalDateTime opened, double balance) {
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this.name = name;
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this.opened = opened;
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this.balance = balance;
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}
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public BankAccountCopyConstructor(BankAccount other) {
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this.name = other.name;
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this.opened = LocalDateTime.now();
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this.balance = 0.0f;
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}
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}
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@@ -1,25 +0,0 @@
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package com.baeldung.constructors;
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import java.time.LocalDateTime;
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class Transaction {
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final BankAccountEmptyConstructor bankAccount;
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final LocalDateTime date;
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final double amount;
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public Transaction(BankAccountEmptyConstructor account, LocalDateTime date, double amount) {
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this.bankAccount = account;
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this.date = date;
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this.amount = amount;
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}
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/*
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* Compilation Error :'(, all final variables must be explicitly initialised.
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* public Transaction() {
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* }
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*/
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public void invalidMethod() {
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// this.amount = 102.03; // Results in a compiler error. You cannot change the value of a final variable.
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}
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}
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@@ -1,59 +0,0 @@
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package com.baeldung.deepcopy;
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import java.io.Serializable;
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public class Address implements Serializable, Cloneable {
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@Override
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public Object clone() {
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try {
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return (Address) super.clone();
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} catch (CloneNotSupportedException e) {
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return new Address(this.street, this.getCity(), this.getCountry());
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}
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}
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private static final long serialVersionUID = 1740913841244949416L;
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private String street;
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private String city;
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private String country;
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public Address(Address that) {
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this(that.getStreet(), that.getCity(), that.getCountry());
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}
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public Address(String street, String city, String country) {
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this.street = street;
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this.city = city;
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this.country = country;
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}
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public Address() {
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}
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public String getStreet() {
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return street;
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}
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public String getCity() {
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return city;
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}
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public String getCountry() {
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return country;
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}
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public void setStreet(String street) {
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this.street = street;
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}
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public void setCity(String city) {
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this.city = city;
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}
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public void setCountry(String country) {
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this.country = country;
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}
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}
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@@ -1,48 +0,0 @@
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package com.baeldung.deepcopy;
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import java.io.Serializable;
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public class User implements Serializable, Cloneable {
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private static final long serialVersionUID = -3427002229954777557L;
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private String firstName;
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private String lastName;
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private Address address;
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public User(String firstName, String lastName, Address address) {
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this.firstName = firstName;
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this.lastName = lastName;
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this.address = address;
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}
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public User(User that) {
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this(that.getFirstName(), that.getLastName(), new Address(that.getAddress()));
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}
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public User() {
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}
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@Override
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public Object clone() {
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User user;
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try {
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user = (User) super.clone();
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} catch (CloneNotSupportedException e) {
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user = new User(this.getFirstName(), this.getLastName(), this.getAddress());
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}
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user.address = (Address) this.address.clone();
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return user;
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}
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public String getFirstName() {
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return firstName;
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}
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public String getLastName() {
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return lastName;
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}
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public Address getAddress() {
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return address;
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}
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}
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@@ -1,36 +0,0 @@
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package com.baeldung.equalshashcode;
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class Money {
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int amount;
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String currencyCode;
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Money(int amount, String currencyCode) {
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this.amount = amount;
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this.currencyCode = currencyCode;
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}
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@Override
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public boolean equals(Object o) {
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if (o == this)
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return true;
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if (!(o instanceof Money))
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return false;
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Money other = (Money)o;
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boolean currencyCodeEquals = (this.currencyCode == null && other.currencyCode == null)
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|| (this.currencyCode != null && this.currencyCode.equals(other.currencyCode));
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return this.amount == other.amount
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&& currencyCodeEquals;
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}
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@Override
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public int hashCode() {
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int result = 17;
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result = 31 * result + amount;
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if (currencyCode != null) {
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result = 31 * result + currencyCode.hashCode();
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}
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return result;
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}
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}
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@@ -1,39 +0,0 @@
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package com.baeldung.equalshashcode;
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class Team {
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final String city;
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final String department;
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Team(String city, String department) {
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this.city = city;
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this.department = department;
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}
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@Override
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public final boolean equals(Object o) {
|
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if (o == this)
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return true;
|
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if (!(o instanceof Team))
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return false;
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Team otherTeam = (Team)o;
|
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boolean cityEquals = (this.city == null && otherTeam.city == null)
|
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|| this.city != null && this.city.equals(otherTeam.city);
|
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boolean departmentEquals = (this.department == null && otherTeam.department == null)
|
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|| this.department != null && this.department.equals(otherTeam.department);
|
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return cityEquals && departmentEquals;
|
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}
|
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|
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@Override
|
||||
public final int hashCode() {
|
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int result = 17;
|
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if (city != null) {
|
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result = 31 * result + city.hashCode();
|
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}
|
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if (department != null) {
|
||||
result = 31 * result + department.hashCode();
|
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}
|
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return result;
|
||||
}
|
||||
|
||||
}
|
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@@ -1,38 +0,0 @@
|
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package com.baeldung.equalshashcode;
|
||||
|
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class Voucher {
|
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|
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private Money value;
|
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private String store;
|
||||
|
||||
Voucher(int amount, String currencyCode, String store) {
|
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this.value = new Money(amount, currencyCode);
|
||||
this.store = store;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object o) {
|
||||
if (o == this)
|
||||
return true;
|
||||
if (!(o instanceof Voucher))
|
||||
return false;
|
||||
Voucher other = (Voucher)o;
|
||||
boolean valueEquals = (this.value == null && other.value == null)
|
||||
|| (this.value != null && this.value.equals(other.value));
|
||||
boolean storeEquals = (this.store == null && other.store == null)
|
||||
|| (this.store != null && this.store.equals(other.store));
|
||||
return valueEquals && storeEquals;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
int result = 17;
|
||||
if (this.value != null) {
|
||||
result = 31 * result + value.hashCode();
|
||||
}
|
||||
if (this.store != null) {
|
||||
result = 31 * result + store.hashCode();
|
||||
}
|
||||
return result;
|
||||
}
|
||||
}
|
||||
@@ -1,30 +0,0 @@
|
||||
package com.baeldung.equalshashcode;
|
||||
|
||||
/* (non-Javadoc)
|
||||
* This class overrides equals, but it doesn't override hashCode.
|
||||
*
|
||||
* To see which problems this leads to:
|
||||
* TeamUnitTest.givenMapKeyWithoutHashCode_whenSearched_thenReturnsWrongValue
|
||||
*/
|
||||
class WrongTeam {
|
||||
|
||||
String city;
|
||||
String department;
|
||||
|
||||
WrongTeam(String city, String department) {
|
||||
this.city = city;
|
||||
this.department = department;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object o) {
|
||||
if (o == this)
|
||||
return true;
|
||||
if (!(o instanceof WrongTeam))
|
||||
return false;
|
||||
WrongTeam otherTeam = (WrongTeam)o;
|
||||
return this.city == otherTeam.city
|
||||
&& this.department == otherTeam.department;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,47 +0,0 @@
|
||||
package com.baeldung.equalshashcode;
|
||||
|
||||
/* (non-Javadoc)
|
||||
* This class extends the Money class that has overridden the equals method and once again overrides the equals method.
|
||||
*
|
||||
* To see which problems this leads to:
|
||||
* MoneyUnitTest.givenMoneyAndVoucherInstances_whenEquals_thenReturnValuesArentSymmetric
|
||||
*/
|
||||
class WrongVoucher extends Money {
|
||||
|
||||
private String store;
|
||||
|
||||
WrongVoucher(int amount, String currencyCode, String store) {
|
||||
super(amount, currencyCode);
|
||||
|
||||
this.store = store;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object o) {
|
||||
if (o == this)
|
||||
return true;
|
||||
if (!(o instanceof WrongVoucher))
|
||||
return false;
|
||||
WrongVoucher other = (WrongVoucher)o;
|
||||
boolean currencyCodeEquals = (this.currencyCode == null && other.currencyCode == null)
|
||||
|| (this.currencyCode != null && this.currencyCode.equals(other.currencyCode));
|
||||
boolean storeEquals = (this.store == null && other.store == null)
|
||||
|| (this.store != null && this.store.equals(other.store));
|
||||
return this.amount == other.amount
|
||||
&& currencyCodeEquals
|
||||
&& storeEquals;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
int result = 17;
|
||||
result = 31 * result + amount;
|
||||
if (this.currencyCode != null) {
|
||||
result = 31 * result + currencyCode.hashCode();
|
||||
}
|
||||
if (this.store != null) {
|
||||
result = 31 * result + store.hashCode();
|
||||
}
|
||||
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;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,5 +0,0 @@
|
||||
package com.baeldung.finalkeyword;
|
||||
|
||||
public class BlackCat {
|
||||
|
||||
}
|
||||
@@ -1,6 +0,0 @@
|
||||
package com.baeldung.finalkeyword;
|
||||
|
||||
public class BlackDog extends Dog {
|
||||
// public void sound() {
|
||||
// }
|
||||
}
|
||||
@@ -1,18 +0,0 @@
|
||||
package com.baeldung.finalkeyword;
|
||||
|
||||
public final class Cat {
|
||||
|
||||
private int weight;
|
||||
|
||||
public int getWeight() {
|
||||
return weight;
|
||||
}
|
||||
|
||||
public void setWeight(int weight) {
|
||||
this.weight = weight;
|
||||
}
|
||||
|
||||
public void methodWithFinalArguments(final int x) {
|
||||
// x=1;
|
||||
}
|
||||
}
|
||||
@@ -1,7 +0,0 @@
|
||||
package com.baeldung.finalkeyword;
|
||||
|
||||
public class Dog {
|
||||
|
||||
public final void sound() {
|
||||
}
|
||||
}
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user