利用java编写一个简单计算器（实现加减乘除）

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import java.util.Scanner;
public class Demo04 {
    public static void main(String[] args) {
        while (true) {
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入要操作的选项：1 加法 2 减法 3 乘法 4 除法");
            String s = scanner.next();
            char select = s.charAt(0);
            switch (select) {
                case '1':
                    System.out.println("请输入第一个数：");
                    double a = scanner.nextDouble();
                    System.out.println("请输入第二个数：");
                    double b = scanner.nextDouble();
                    double sum = add(a, b);
                    System.out.println("两个数的和为:" + sum);
                    break;
                case '2':
                    System.out.println("请输入被减数：");
                    double c = scanner.nextDouble();
                    System.out.println("请输入减数：");
                    double d = scanner.nextDouble();
                    double difference = reduce(c, d);
                    System.out.println("两个数的差为:" + difference);
                    break;
                case '3':
                    System.out.println("请输入第一个数：");
                    double e = scanner.nextDouble();
                    System.out.println("请输入第二个数：");
                    double f = scanner.nextDouble();
                    double ride = ride(e, f);
                    System.out.println("两个数的积为:" + ride);
                    break;
                case '4':
                    System.out.println("请输入被除数：");
                    double g = scanner.nextDouble();
                    System.out.println("请输入除数：");
                    double h = scanner.nextDouble();
                    double except = except(g, h);
                    System.out.println("两个数的商为:" + except);
                default:
                    System.out.println("你的输入有误，请重新输入：");
                    continue;
            }
            System.out.println("是否继续？是请输入Y，输入其他退出");
            String input = scanner.next();
            char go = input.charAt(0);
            if (go != 'Y'){
                break;
            }
        }
        }
    public static double add(double a,double b){
        return a + b;
    }
    public static double reduce(double a,double b){
        return a - b;
    }
    public static double ride(double a,double b){
        return a * b;
    }
    public static double except(double a,double b){
        return a / b;
    }
}

运行结果：