equalsw 重写后无法判断属性值

Question

package Equals的用法;public class Phone1 { public int cpu = 2; public void say() { System.out.println("我是手机"); }}package Equals的用法;public class Phone2 { public int cpu = 2; public void say() { System.out.println("我是手机"); } public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Phone2 other = (Phone2) obj; if (cpu != other.cpu) return false; return true; }}package Equals的用法;public class User { public static void main(String[] args) { Phone1 aPhone1 = new Phone1(); Phone2 aPhone2 = new Phone2(); if (aPhone1.equals(aPhone2)) { System.out.println("比较的是对象的地址: 一样"); } else { System.out.println("比较的是对象的地址: 不一样"); } if (aPhone2.equals(aPhone1)) { System.out.println("比较的是对象的属性: 一样"); } else { System.out.println("比较的是对象的属性: 不一样"); } }}

Answer 1

aphone1和aphone2的类型都不一样，一个是Phone1，一个是Phone2，上来比较就会return false

比较的应该是同一类型的两个对象

Phone2 aPhone1 = new Phone2();

Phone2 aPhone2 = new Phone2();

这样的aPhone1和aPhone2比较才有意义