Java 如何重复整个程序直到手动终止？

我的代码运行良好，除了我应该询问用户是否愿意退出程序的部分。这是一个简单的y/n，如果输入'n'，则应触发整个程序重复，并在输入'y'时终止。我知道我需要使用while循环，但我就是不知道我需要如何在代码中编写它，以便它像预期的那样工作

import java.util.*;

public class MilitaryTime 

{

public static void main (String [] args)    
{

            Scanner in = new Scanner(System.in);
            int hour1, minute1, hour2, minute2;

            System.out.print("Please enter the first time: ");
            int time1 = in.nextInt();
            System.out.println();
            hour1 = time1 / 100;
            minute1 = time1 % 100;

            System.out.print("Please enter the second time: ");
            int time2 = in.nextInt();
            System.out.println();
            hour2 = time2 / 100;
            minute2 = time2 % 100;

            System.out.println("Time elapsed: " + (Math.abs(hour1 - hour2) + " Hours, " + (Math.abs(minute1 - minute2) + " Minutes \n")));

            System.out.print("Do you want to quit? (y/n): ");
            String answer = in.next();

            while (answer != "n")
            {

            }

    }

}

---

在此之前，请重新运行main方法

while (answer.equals("n")) // comment by drewmoore; its helpfull for strings..
{
    // you said, program should repeat if n is pressed. 
    // so, if answer is equal to n then execute the main function.
    main();
}

这将一直执行，直到用户按下其他按钮

---

其次，您不需要在循环时使用

。这也可以通过
来实现。
您可能应该（至少）将代码分为两种不同的方法，但我将尝试指出一种方法，以最少的更改实现您想要的：

public static void main (String [] args)    
{
    String answer = null;  // you have no answer yet...
    do {   // ... but you want to execute your stuff at least once
        Scanner in = new Scanner(System.in);
        int hour1, minute1, hour2, minute2;

        System.out.print("Please enter the first time: ");
        int time1 = in.nextInt();
        System.out.println();
        hour1 = time1 / 100;
        minute1 = time1 % 100;

        System.out.print("Please enter the second time: ");
        int time2 = in.nextInt();
        System.out.println();
        hour2 = time2 / 100;
        minute2 = time2 % 100;

        System.out.println("Time elapsed: " + (Math.abs(hour1 - hour2) + " Hours, " + (Math.abs(minute1 - minute2) + " Minutes \n")));

        System.out.print("Do you want to quit? (y/n): ");
        answer = in.next();
    } while (!answer.equalsIgnoreCase("n"));

}

^^也就是说，将
while（answer！=“n”）
更改为
while（！answer.equals（“n”）
（1）调用
main（）
的代码确切位于何处？我假设您希望建议所有代码都应该用
main
以外的方法提取。（2） 由于
答案
仅在第一次迭代后可用，因此这只能通过
do…while
loop.Perfect来实现。非常感谢你！