package com.mydemo.controller;

public class TestEquals {
    public static void main(String[] args) {
        Dog d1 = new Dog(1, 2, 3);
        Dog d2 = new Dog(1, 2, 3);
        // d1 永遠不等於 d2,比較的是兩個對象的引用
        System.out.println(d1 == d2);
        // Object 的equals 方法默認比較兩個對象的引用
        System.out.println(d1.equals(d2));
        
 
// String 類重寫了Object 的equals方法
    }
}
class Dog {
    int color;
    int weight;
    int height;
    
    public Dog(int color, int weight, int height) {
        this.color = color;
        this.weight = weight;
        this.height = height;
    }
}

java equals 方法