接口实际上是定义一个规范、标准

 1 package TomText;
 2 //算术运算符的使用示例。
 3 public class TomText_34 {
 4     public static void main(String args[]){
 5         int a = 5+4;        //a=9
 6         int b = a*2;        //b=18
 7         int c = b/4;         //c=4
 8         int d = b-c;         //d=14
 9         int e = -d;          //e=-14
10         int f = e % 4;       //f=-2
11         double g = 18.4;
12         double h = g % 4;    //h=2.4
13         int i = 3;
14         int j = i++;        //i=4，j=3
15         int k = ++i;        //i=5，k=5
16         System.out.println("a=" + a);
17         System.out.println("b=" + b);
18         System.out.println("c=" + c);
19         System.out.println("d=" + d);
20         System.out.println("e=" + e);
21         System.out.println("f=" + f);
22         System.out.println("g=" + g);
23         System.out.println("h=" + h);
24         System.out.println("i=" + i);
25         System.out.println("j=" + j);
26         System.out.println("k=" + k);
27         }
28 
29 }