Object--equals

灰太狼 2022-05-12 08:12 163阅读 0赞

package jave;
    
    import javax.jws.soap.SOAPBinding;
    
    /*Object--equals*/
    public class Equals {
    
    	public static void main(String[] args) {
    		Cat c1 = new Cat(1, 2, 3);
    		Cat c2 = new Cat(1, 2, 3);
    		System.out.println(c1 == c2);//实际比较两者的地址
    		System.out.println(c1.equals(c2));
    		
    		String s1 = new String("Hello");
    		String s2 = new String("Hello");
    		System.out.println(s1.equals(s2));//比较两个对象的值相不相等
    		
    		
    	}
    }
    
    
    class Cat {
    	int color;
    	int height;
    	int weight;
    	
    	public Cat (int color, int height, int weight){
    		this.color = color;
    		this.height = height;
    		this.weight = weight;
    	}
    	
    
    //重写equals方法
    	public boolean equals(Object obj) {
    		if(obj == null) 
    			return false;
    		else {
    			if(obj instanceof Cat) {//instanceof 左边对象是否为instanceof 右边类的实例，返回一个boolean类型值。
    				Cat c = (Cat)obj;
    				if(c.color == this.color && c.height == this.height && c.weight == this.weight )
    					return true;
    			}
    		}
    		return false;
    	}
    }

Object--equals

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