面向对象

 1 import java.util.Scanner;
 2 /*
 3  * @author zhang
 4  * time 2019.01.12
 5  */
 6 public class JiSuanQi {
 7     double num1;
 8     double num2;
 9     double he;
10     int i =1;
11     Scanner input = new Scanner(System.in);
12     
13     
14     public void result() {
15         do{
16             System.out.println("请输入第一个数字：");
17             num1 = input.nextDouble();
18             System.out.println("请输入运算符：");
19             String fuHao = input.next();
20             System.out.println("请输入第二个数字：");
21             num2 = input.nextDouble();
22             if(fuHao.equals("+")) {
23                 System.out.println(num1+"+"+num2+"="+(num1+num2));
24             }else if(fuHao.equals("-")) {
25                 System.out.println(num1+"-"+num2+"="+(num1-num2));
26             }else if(fuHao.equals("*")) {
27                 System.out.println(num1+"*"+num2+"="+(num1*num2));
28             }else if(fuHao.equals("/")) {
29                 System.out.println(num1+"/"+num2+"="+(num1/num2));
30             }else {
31                 System.out.println("您输入的运算有误！请重新输入");
32                 continue;
33             }
34             System.out.println("是否继续计算？1为继续，0为退出");
35             i = input.nextInt();
36         }while(i == 1);
37         System.out.println("谢谢使用！");
38     }
39 }

1 public class TestJiSuanQi {
2     public static void main(String[] args) {
3         JiSuanQi jieGuo = new JiSuanQi();
4         jieGuo.result();
5     }
6 }