Java中布尔类型操作符[ ` &= ` , ` |= ` , 与 ` ^= ` ]

桃扇骨 2022-10-20 12:17 136阅读 0赞

# 一. 结论 #

今天刷Flink代码的时候, 发现操作符 `|=` , 这个是什么鬼, 做了这么多年Java瞬间觉得好丢人…

总结:  
跟正常的 && , || 操作差不多,输出的结果都是boolean类型.

<table> 
 <thead> 
  <tr> 
   <th>a值</th> 
   <th>操作符</th> 
   <th>b值</th> 
   <th>结果</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>true</td> 
   <td>&amp;=</td> 
   <td>true</td> 
   <td>true</td> 
  </tr> 
  <tr> 
   <td>true</td> 
   <td>&amp;=</td> 
   <td>false</td> 
   <td>false</td> 
  </tr> 
  <tr> 
   <td>false</td> 
   <td>&amp;=</td> 
   <td>true</td> 
   <td>false</td> 
  </tr> 
  <tr> 
   <td>false</td> 
   <td>&amp;=</td> 
   <td>false</td> 
   <td>false</td> 
  </tr> 
  <tr> 
   <td></td> 
   <td></td> 
   <td></td> 
   <td></td> 
  </tr> 
  <tr> 
   <td>true</td> 
   <td>|=</td> 
   <td>true</td> 
   <td>true</td> 
  </tr> 
  <tr> 
   <td>true</td> 
   <td>|=</td> 
   <td>false</td> 
   <td>true</td> 
  </tr> 
  <tr> 
   <td>false</td> 
   <td>|=</td> 
   <td>true</td> 
   <td>true</td> 
  </tr> 
  <tr> 
   <td>false</td> 
   <td>|=</td> 
   <td>false</td> 
   <td>false</td> 
  </tr> 
  <tr> 
   <td></td> 
   <td></td> 
   <td></td> 
   <td></td> 
  </tr> 
  <tr> 
   <td>true</td> 
   <td>^=</td> 
   <td>true</td> 
   <td>false</td> 
  </tr> 
  <tr> 
   <td>true</td> 
   <td>^=</td> 
   <td>false</td> 
   <td>true</td> 
  </tr> 
  <tr> 
   <td>false</td> 
   <td>^=</td> 
   <td>true</td> 
   <td>true</td> 
  </tr> 
  <tr> 
   <td>false</td> 
   <td>^=</td> 
   <td>false</td> 
   <td>false</td> 
  </tr> 
 </tbody> 
</table>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nbG9uZ180NDQ0_size_16_color_FFFFFF_t_70]

# 二. 验证代码 #

public class MainMethod { 
        public static void main(String[] args) { 
    
            System.out.println(" ======================");
            boolean flag = true;
            flag &= true;
            System.out.println("true\t&=\ttrue\t==>\t" + flag);
            flag = true;
            flag &= false;
            System.out.println("true\t&=\tfalse\t==>\t" + flag);
            flag = false;
            flag &= true;
            System.out.println("false\t&=\ttrue\t==>\t" + flag);
            flag = false;
            flag &= false;
            System.out.println("false\t&=\tfalse\t==>\t" + flag+"\n");
    
            System.out.println(" ======================");
            flag = true;
            flag |= true;
            System.out.println("true\t|=\ttrue\t==>\t" + flag);
            flag = true;
            flag |= false;
            System.out.println("true\t|=\tfalse\t==>\t" + flag);
            flag = false;
            flag |= true;
            System.out.println("false\t|=\ttrue\t==>\t" + flag);
            flag = false;
            flag |= false;
            System.out.println("false\t|=\tfalse\t==>\t" + flag+"\n");
    
            System.out.println("^= 相同为假，不同为真");
            flag = true;
            flag ^= true;
            System.out.println("true\t^=\ttrue\t==>\t" + flag);
            flag = true;
            flag ^= false;
            System.out.println("true\t^=\tfalse\t==>\t" + flag);
            flag = false;
            flag ^= true;
            System.out.println("false\t^=\ttrue\t==>\t" + flag);
            flag = false;
            flag ^= false;
            System.out.println("false\t^=\tfalse\t==>\t" + flag);
        }

代码输出:

======================
    true	&=	true	==>	true
    true	&=	false	==>	false
    false	&=	true	==>	false
    false	&=	false	==>	false
    
     ======================
    true	|=	true	==>	true
    true	|=	false	==>	true
    false	|=	true	==>	true
    false	|=	false	==>	false
    
    ^=  相同为假，不同为真
    true	^=	true	==>	false
    true	^=	false	==>	true
    false	^=	true	==>	true
    false	^=	false	==>	false

参考文档:  
https://blog.csdn.net/ziwen00/article/details/40656897

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nbG9uZ180NDQ0_size_16_color_FFFFFF_t_70]: /images/20221020/102d8055870445d9a74762de5428200b.png