java代码实例 使用switch实现简易的计算器，实现加减乘除

import java.util.Scanner;

/*
 * 使用switch实现简易的计算器（实现加减乘除); 
 */
public class test {
        public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                System.out.println("输入一个表达式(例如： 5 + 3)：");
                int a = sc.nextInt();
                char ch = sc.next().charAt(0);
                int b = sc.nextInt();
                switch (ch) {
                case '+':
                        jia(a, b);
                        break;
                case '-':
                        jian(a, b);
                        break;
                case '*':
                        cheng(a, b);
                        break;
                case '/':
                        chu(a, b);
                        break;
                default:
                        System.out.println("输入错误");
                        break;
                }
        }

        private static void cheng(int a, int b) {
                int sum = a * b;
                System.out.println("两数积：" + sum);
        }

        private static void jian(int a, int b) {
                int sum = a - b;
                System.out.println("两数差：" + sum);
        }

        private static void chu(int a, int b) {
                if (b == 0) {
                        System.out.println("除数不能为零~");
                } else {
                        int sum = a / b;
                        System.out.println("两数商：" + sum);
                }
        }
        private static void jia(int a, int b) {
                int sum = a + b;
                System.out.println("两数和：" + sum);
        }
}