Java语言学习三（Java运算符）

阳光穿透心脏的1/2处 2023-07-05 14:44 53阅读 0赞

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Java语言定义了八种基本数据类型，围绕八种基本数据类型Java语言定义很多运算符，按照表达式中的操作数个数分为单目运算符、双目运算符和三目运算符；按照运算符的功能分为算术运算符、赋值运算符、关系运算符、逻辑运算符、位运算符和其他运算符。

## 算术运算符 ##

单目运算：

~（按位取反）、! (取非)、-（负号运算符）、 ++（自增）、 - -（自减）

**~按位取反例程**  
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\++ 与 - -  
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双目运算：

+ - * / %（取余）

三目运算：  
a>b?true:false 说明：当a大于b的时候，为true，否则为false；

## 关系运算符 ##

用于条件判断

==,!=,>=,<=,>,<

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 7]  
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## 位与逻辑 ##

与（&）、非（~）、或（|）、异或（^）

**异或例程**

<table> 
 <thead> 
  <tr> 
   <th>异或运算</th> 
   <th>结果</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>true^ture</td> 
   <td>0</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>true^false</td> 
   <td>1</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>false^true</td> 
   <td>1</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>false^false</td> 
   <td>0</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>1^1</td> 
   <td>0</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>1^0</td> 
   <td>1</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>0^1</td> 
   <td>1</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>0^0</td> 
   <td>0</td> 
  </tr> 
  <tr> 
   <td>–</td> 
   <td>–</td> 
  </tr> 
  <tr> 
   <td>10^-5</td> 
   <td>-15</td> 
  </tr> 
 </tbody> 
</table>

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位与和位或与上述位异或操作相同

## 逻辑运算符 ##

与（&&）、非（!）、或（||）

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 12]  
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上述例程说明使用||条件判断，只要前面条件为真，后面条件不再执行判断，而&&条件判断，前后的条件都需要判断

## 赋值运算符 ##

= += -= *= /= %= &= ^= |= <<= >>=

public class HelloWorld
    {
    	public static void main(String[] args)
    	{
    		int a = 0;
    		a+=10;//相等于a = a + 10 = 10;
    		System.out.println("Line7 a = "+a);
    		a-=5;//相等于a = a - 5 = 10-5=5;
    		System.out.println("Line9 a = "+a);
    		a%=3;//相等于a = a % 5 = 5%3=2;
    		System.out.println("Line11 a = "+a);
    		a*=3;//相等于a = a * 3 = 2*3=6;
    		System.out.println("Line13 a = "+a);
    		a/=6;//相等于a = a / 6 = 6*6=1;
    		System.out.println("Line15 a = "+a);
    		a&=5;//相等于a=a&5
    		//a = 00000001
    		//5 = 00000101
    		//& = 00000001=1
    		System.out.println("Line20 a = "+a);
    		a^=4;//相等于a=a^4
    		//a = 00000001
    		//4 = 00000100
    		//^ = 00000101 正数补码等于原码00000101=5
    		System.out.println("Line25 a = "+a);
    		a|=2;//相等于a=a|2
    		//a = 00000101
    		//2 = 00000010
    		//| = 00000111 正数补码等于原码00000111=7
    		System.out.println("Line30 a = "+a);
    		a<<=1;//相等于a=a<<1
    		//a		= 00000111
    		//<<1	= 00001110 正数补码等于原码00001110=8+4+2=14
    		System.out.println("Lin34 a = "+a);
    		a>>=2;//相等于a=a>>2
    		//a		= 00001110
    		//>>2	= 00000011 正数补码等于原码00000011=3
    		System.out.println("Line38 a = "+a);
    	}
    
    
    }

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## 位移运算符 ##

<< 带符号左移 >>带符号右移 >>> 无符号右移
    
    		//带符号右移 正数右移，高位补0，负数右移高位补1
    		//无符号右移 无论是正数还是负数，高位通通补0

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无符号右移可能导致数值越界,a>>>2返回Int类型，所以b>>>2=1073741822,如果1073741822%256=254，将254转化为byte类型等于-2

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## 运算符优先级 ##

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优先级例程  
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