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提取碼：r8ky
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EQUALS重寫

編寫代碼如下：

創建Pet的父類

package com.chongxie;

public class Pet {
    private String name;
    private  int age;
    private String sex;

    public Pet() {
    }

    public Pet(String name, int age, String sex) {
        
 
this.name = name;
        this.age = age;
        this.sex = sex;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this
 
.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public boolean equals(Object obj){
        if(obj instanceof Pet){
            Pet pet = (Pet)obj;
            if(pet.getName().equals(this.getName())&&pet.getAge()==this
 
.getAge()&&pet.getSex().equals(this.getSex())){
                return true;
            }
        }
        return false;
    }


}

創建Dog子類：

package com.chongxie;

public class Dog extends Pet{
    private  String strain;

    public Dog(String name, int age, String sex, String strain) {
        super(name, age, sex);
        this.strain = strain;
    }

    public String getStrain() {
        return strain;
    }

    public void setStrain(String strain) {
        this.strain = strain;
    }


}

測試類：

package com.chongxie;

public class Test {
    public static void main(String[] args) {
        Pet dog1 = new Dog("狗狗",10,"公","拉布拉多犬");
        Pet dog2 = new Dog("狗狗",10,"公","拉布拉多犬");
        System.out.println(dog1==dog2);
        System.out.println(dog1.equals(dog2));

    }
}

輸出結果為：

2019年1月19日 面向對象-->重寫