Java方法07：练习打一个计算器

import java.util.Scanner;

public class Demo06 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String y = "Y";

        while (y.equals("Y")){
            System.out.println("请输入第一个数");
            double num1 = scanner.nextDouble();

            System.out.println("请输入计算方式");
            String x = scanner.next();

            System.out.println("请输入第二个数");
            double num2 = scanner.nextDouble();

            double result = 0.0;
            switch (x){
                case "+":
                    result = add(num1,num2);
                    break;
                case "-":
                    result = jian(num1,num2);
                    break;
                case "*":
                    result = cheng(num1,num2);
                    break;
                case "/":
                    result = chu(num1,num2);
                default:
                    System.out.println("输出有误");
            }
            System.out.println(num1+x+num2+"="+result);
            System.out.println("是否继续（Y/N）");
            y = scanner.next();
        }

        scanner.close();
        System.out.println("欢迎再次使用计算机");

    }
    public static double add(double a,double b){
        return a+b;}
    public static double jian(double c,double d){
        return c-d;
    }
    public static double cheng(double e,double f){
        return e*f;
    }
    public static double chu(double g,double h){
        return g/h;
    }

}