Java “equals”与“==”哪个好？

灰太狼 2021-02-13 16:52 752阅读 0赞

## equals 与 == 的区别 ##

> == ：比较的是应用地址  
> equals ：比较的是值

我们可以新建a,b,c三个变量来更好的了解两者的区别  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgzODU4OQ_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgzODU4OQ_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgzODU4OQ_size_16_color_FFFFFF_t_70 2]  
示例代码：

package lianxi;
    
    public class equals { 
        public static void main(String[] args){ 
            String a = "one";
            String b = "one";
            String c = new String ("one");
            System.out.println(a.equals(b));
            System.out.println(a.equals(c));
    
        }
    }

package lianxi;
    
    public class equals { 
        public static void main(String[] args){ 
            String a = "one";
            String b = "one";
            String c = new String ("one");
            System.out.println(a == b);
            System.out.println(a == c);
    
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgzODU4OQ_size_16_color_FFFFFF_t_70]: /images/1613235155722.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgzODU4OQ_size_16_color_FFFFFF_t_70 1]: /images/1613235131276.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDgzODU4OQ_size_16_color_FFFFFF_t_70 2]: /images/1613235106438.png