java - 如何让这个程序返回提示直到用户退出

Question

在为我的程序编写代码时，我想在继续编写操作之前测试第一部分。虽然我有用户输入，但我希望在每个操作(添加、删除 ..)完成后显示选项，直到用户按下退出。我该如何修改我的代码来做到这一点？

import java.io.*;
import java.util.*;

public class Records {

    public static void main(String[] args) {
        int choice;
        do {
            System.out.println("1.Add \n 2.Delete \n 3.Update \n 4.Show \n Exit");
            //BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            //int choice;
            System.out.println("Enter your Choice : ");
            Scanner sc = new Scanner(System.in);
            choice = sc.nextInt();

            switch (choice) {
                case 1: 
                    System.out.println("Getting ready to Add a Record ");
                    //set();
                    break;

                case 2: 
                    System.out.println("Getting ready to Delete a Record ");
                    //delete();
                    break;

                case 3: 
                    System.out.println("Getting ready to Update a Record ");
                    //update();
                    break;

                case 4: 
                    System.out.println("Here is your record ");
                    //display();
                    break;

                case 5: 
                    System.out.println("Out we go.");
                    System.exit(0);
                    //exit();
                    break;

                default: 
                    System.out.println("Try again");
                    break;
            }
        } while ( choice > 5 || choice < 1 );
    }
}

Answer 1

只需将您的 while 条件更改为:

} while ( choice > 0 && choice < 5 );