1 package debug;
 2 
 3 class Demo2 {
 4     public static void main(String[] args){
 5         int a = 1;
 6         int b = 2;
 7         System.out.println("a:" + a + ",b:" + b);
 8         
 9         //方法一，採用異或方法
10         a = a ^ b;
11         b = a ^ b;
12         a = a ^ b;
13         System.out.println("a:" + a + ",b:" + b);
 
14         
15         //方法二，一句話方法
16         b = (a + b) - (a = b);
17         System.out.println("a:" + a + ",b:" + b);
18     }
19 }