java笔记4之比较运算符

/*
   比较运算符：
       ==,!=,>,>=,<,<=

   特点：
       无论你的操作是简单还是复杂，结果是boolean类型。

   注意事项：
       "=="不能写成"="。
*/

 1 class OperatorDemo {
 2     public static void main(String[] args) {
 3         int x = 3;
 4         int y = 4;
 5         int z = 3;
 6     
 7         System.out.println(x == y);
 8         System.out.println(x == z);
 9         System.out.println((x+y) == (x+z));
10         System.out.println("------------");
11         
12         System.out.println(x != y);
13         System.out.println(x > y);
14         System.out.println(x >= y);
15         System.out.println(x < y);
16         System.out.println(x <= y);
17         System.out.println("------------");
18         
19         int a = 10;
20         int b = 20;
21         
22         //boolean flag = (a == b);
23         //boolean flag = (a = b); //这个是有问题的，不兼容的类型
24         //System.out.println(flag);
25         
26         int c = (a = b); //把b赋值给a，然后把a留下来
27         System.out.println(c);
28     }
29 }