JAVA入门3 运算符

迷南。 2021-09-19 03:12 300阅读 0赞

# Java算数运算符 #

![在这里插入图片描述][20190427210949316.png]

package com.javabase;
    
    public class DataTest {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		//声明一个数据类型是int，变量名字是a,值是76
    		int a=76;
    		int b=2;
    		System.out.println("a+b="+(a+b));
    		System.out.println("a-b="+(a-b));
    		System.out.println("a*b="+(a*b));
    		System.out.println("a/b="+(a/b));
    		System.out.println("a%b="+(a%b));
    		System.out.println("a++="+(a++));//先赋值再++
    		System.out.println("a++="+(a));
    		System.out.println("a++="+(++a));//先++再赋值
    		System.out.println("a--="+(a--));
    	}
    
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gzNTYzNjM_size_16_color_FFFFFF_t_70]

# 关系运算符 #

![在这里插入图片描述][20190427211948625.png]

package com.javabase;
    
    public class DataTest2 {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		int a=87;
    		int b=90;
    		System.out.println("a==b的结果："+(a==b));
    		System.out.println("a!=b的结果："+(a!=b));
    		System.out.println("a>b的结果："+(a>b));
    		System.out.println("a<b的结果："+(a<b));
    		System.out.println("a>=b的结果："+(a>=b));
    		System.out.println("a<=b的结果："+(a<=b));
    	}
    
    }

a==b的结果：false  
a!=b的结果：true  
a>b的结果：false  
a<b的结果：true  
a>=b的结果：false  
a<=b的结果：true

# 逻辑运算 #

![在这里插入图片描述][20190427212428358.png]

package com.javabase;
    
    public class DataTest3 {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		boolean a=true;
    		boolean b=false;
    		System.out.println("a&&b的结果： "+(a&&b));
    		System.out.println("a||b的结果： "+(a||b));
    		System.out.println("!b的结果： "+(!b));
    	}
    
    }

a&&b的结果： false  
a||b的结果： true  
!b的结果： true

[20190427210949316.png]: /images/20210726/c40521ac5d2a48b2b908ecb739280e86.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gzNTYzNjM_size_16_color_FFFFFF_t_70]: /images/20210726/20b9ef6e009c4ebf90284ae729d81c46.png
[20190427211948625.png]: /images/20210726/0af92e1fc50f4988b3f3168e05c5638a.png
[20190427212428358.png]: /images/20210726/1c80bfd7ac8c43a089f33683db38d1a7.png