java的自增和自减

 1 class Untitled {
 2     public static void main(String[] args) {
 3         int a = 3;
 4         int b = a++;   //a先赋值给b，然后a再自己加1
 5         System.out.println("a="+a);  //输出a=3
 6         System.out.println("b="+b);    //输出b=4
 7         
 8         System.out.println("\n");
 9         
10         a = 3;
11         int c = ++a;   //a先加1，然后再赋值给c
12         System.out.println("a="+a);    //输出a=4
13         System.out.println("c="+c);    //输出c=4
14         
15         
16         System.out.println("\n");
17         
18         
19         c++;
20         System.out.println(c);　　//输出5
21         
22         ++c;
23         System.out.println(c);　　//输出6
24     }
25 }