Question

好的，所以这是我的代码到目前为止我真的需要帮助才能在我输入quit之后退出，并且在输入一个字符串后程序也不会结束。任何帮助或链接到一些帮助将不胜感激我是一个非常新手的程序员。

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

public class reverse 
{
    public static void main(String [] args)
    {
        String input = null;

        Scanner keyboard = new Scanner(System.in);

        System.out.print("Please enter a string for reversal or type QUIT to exit: ");

        input = keyboard.nextLine();
        if(input.equals("quit"))
        {
           //close the program
        }

        Reverser(input, (input.length() - 1));
        System.exit(0);


    }
    public static void Reverser(String str, int size)
    {
        if(size>=0)
        {
            System.out.print(str.charAt(size));
            Reverser(str,size-1);
        }
    }




}

Answer 1

您可以尝试这样的事情

input = keyboard.nextLine();
while(!input.equals("quit"))
{
    Reverser(input, (input.length() - 1));
    System.out.println("Please enter a string for reversal or type QUIT to exit: ");
    input = keyboard.nextLine();
}

Answer 2

这是一个可能的解决方案，它在键入多个输入后不会结束：

    Scanner keyboard = new Scanner(System.in);

    String input;
    System.out.println("Please enter a String for reversal or type quit to exit:");
    while (!(input = keyboard.nextLine()).equals("quit")) { // wait until the input is quit
        // do stuff with input
    }

    keyboard.close(); // don't forget to close the scanner when you are done

控制台输出：

Please enter a String for reversal or type quit to exit:
blah
test
quit

Process finished with exit code 0

如果您已完成while循环，只需添加break;。

进入退出后如何让我的程序退出

2 个答案: