1 public class TestCounter {
 2     public static void main(String[] args) {
 3         Scanner scanner = new Scanner(System.in);
 4         System.out.println("-----计算器-----");
 5         System.out.println("请输入第一个数字:");
 6         float i = scanner.nextFloat();
 7         System.out.println("请输入加减乘除符号");
 8         String c = scanner.next();
 9         System.out.println("请输入第二个数字:");
10         float x = scanner.nextFloat();
11         switch (c){
12             case "+" :float plus = plus(i,x);
13                 System.out.println(i+"+"+x+"="+plus);
14                 break;
15             case "-" :float reduce = reduce(i,x);
16                 System.out.println(i+"-"+x+"="+reduce);
17                 break;
18             case "*" :float ride = ride(i,x);
19                 System.out.println(i+"*"+x+"="+ride);
20                 break;
21             case "/" :float except = except(i,x);
22                 System.out.println(i+"/"+x+"="+except);
23                 break;
24         }
25     }
26 
27     private static float plus(float i,float x) {
28         return i+x;
29     }
30     private static float reduce(float i,float x) {
31         return i-x;
32     }
33     private static float ride(float i,float x) {
34         return i*x;
35     }
36     private static float except(float i,float x) {
37         return i/x;
38     }