41 lines
965 B
Java
41 lines
965 B
Java
// equalshashcode/SubtypeEquality2.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.util.*;
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class Dog2 extends Animal {
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Dog2(String name, Size size) {
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super(name, size);
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}
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@Override
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public boolean equals(Object rval) {
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return rval instanceof Dog2 &&
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super.equals(rval);
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}
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}
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class Pig2 extends Animal {
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Pig2(String name, Size size) {
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super(name, size);
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}
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@Override
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public boolean equals(Object rval) {
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return rval instanceof Pig2 &&
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super.equals(rval);
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}
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}
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public class SubtypeEquality2 {
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public static void main(String[] args) {
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Set<Animal> pets = new HashSet<>();
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pets.add(new Dog2("Ralph", Size.MEDIUM));
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pets.add(new Pig2("Ralph", Size.MEDIUM));
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pets.forEach(System.out::println);
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}
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}
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/* Output:
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Dog2[0]: Ralph MEDIUM a752aeee
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Pig2[1]: Ralph MEDIUM a752aeee
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*/
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