java - 重播循环允许脚本随时退出

Question

我有一个任务是制作一个游戏，计算机生成 1 到 100 之间的数字，并且用户尝试猜测它。我已经对其进行了编码，但我无法让我的重播发挥作用。它给了我一个关于索引超出范围的错误，我不知道为什么。我还需要程序能够在游戏过程中随时退出并调用方法exit。我不知道该怎么做。这是我当前的代码。

import java.util.Scanner;
import java.util.Random;
/*
Program to let user guess random generated number between 1 and 100 
*/
public class Hilo  
{
Scanner scan = new Scanner(System.in);
Random generator = new Random(); // Random generator to generate number 
int computernumber;
int usernumber;
int guesses = 0;
char play;
char playagain;
boolean replay;

public void computerguess()
{
    computernumber = generator.nextInt(100)+1;
}
public void userguess()
{
    if(play == 'y')
    {
    System.out.println("Please guess a number between 1 and 100");
    usernumber = scan.nextInt();
    highorlow();
}
}
public void highorlow()
{
    if(usernumber == computernumber)
    {
    System.out.println("Good Job! Your guessed the correct number!"); // Checks if you guessed the correct number
        guesses = guesses +1; // Adds 1 to guess count
    }
    else
    {
        if(usernumber > computernumber) // Checks if your number is higher than the computers
        {
            System.out.println("Your guessed to high please try again");
                guesses =guesses +1; // Adds 1 to guess count
            userguess(); // Lets user guess again
        }
        else
        {
            if(usernumber < computernumber) // Checks if your number is less than the computers number
            {
                System.out.println("Your guess was to low please try again");
                guesses = guesses +1;// Adds 1 to guess count
                userguess(); // Lets user guess again
            }
        }
    }
}
public void instructions() // Gives instructions on how to play 
{
    System.out.println("To play simply guess a number between 1 and 100. \nThe computer will tell you if you are correct or inncorrect. \n Press y to continue \n Press e at any time to exit");
    play = scan.nextLine().charAt(0);
}
public void printscore()
{
    System.out.println("Your took "+guesses+" guesses to get the correct number \n"); // Tells user how many guesses they took 
}
public void replay() // lets user replay game
{
    System.out.println("Would you like to play again? Y for yes N for no");
    playagain = scan.nextLine().charAt(0);;
    if(playagain =='y')
    {
    replay = true;
    play();
    }
}
public void exit()
{
    System.out.println("Thanks for playing! The number was "+computernumber+"");
}
public void play()
{
    instructions();
    computerguess();
    userguess();
    printscore();
    replay();
    if(replay == true)
    {
    instructions();
    computerguess();
    userguess();
    printscore();
    replay();
}
    else
    {
        if(replay == false)
        {
        System.exit(3);
        }
    }
    }

public static void main(String[] args)
{
    Hilo guess = new Hilo();
    guess.play();
}
}

Answer 1

也许这样就可以了。

import java.util.Scanner;
import java.util.Random;
/*
Program to let user guess random generated number between 1 and 100 
*/
public class Hilo  
{
Scanner scan = new Scanner(System.in);
Random generator = new Random(); // Random generator to generate number 
int computernumber;
int usernumber;
int guesses = 0;
String play;
boolean replay;

public void computerguess()
{
    computernumber = generator.nextInt(100)+1;
}
public void userguess()
{
    if("y".equalsIgnoreCase(play))
    {
    System.out.println("Please guess a number between 1 and 100");
    String input = scan.next();
    if("e".equalsIgnoreCase(input)) exit();
    else usernumber = Integer.parseInt(input);
    highorlow();
    }else if("e".equalsIgnoreCase(play)) exit();
}
public void highorlow()
{
    if(usernumber == computernumber)
    {
    System.out.println("Good Job! Your guessed the correct number!"); // Checks if you guessed the correct number
        guesses = guesses +1; // Adds 1 to guess count
    }
    else
    {
        if(usernumber > computernumber) // Checks if your number is higher than the computers
        {
            System.out.println("Your guessed to high please try again");
                guesses =guesses +1; // Adds 1 to guess count
            userguess(); // Lets user guess again
        }
        else
        {
            if(usernumber < computernumber) // Checks if your number is less than the computers number
            {
                System.out.println("Your guess was to low please try again");
                guesses = guesses +1;// Adds 1 to guess count
                userguess(); // Lets user guess again
            }
        }
    }
}
public void instructions() // Gives instructions on how to play 
{
    System.out.println("To play simply guess a number between 1 and 100. \nThe computer will tell you if you are correct or inncorrect. \n Press y to continue \n Press e at any time to exit");
    play = scan.next();
}
public void printscore()
{
    System.out.println("Your took "+guesses+" guesses to get the correct number \n"); // Tells user how many guesses they took 
}
public void replay() // lets user replay game
{
    System.out.println("Would you like to play again? Y for yes N for no");
    String input = scan.next();
    if("y".equalsIgnoreCase(input))
    {
    replay = true;
    play();
    }
}
public void exit()
{
    System.out.println("Thanks for playing! The number was "+computernumber+"");
    System.exit(3);
}
public void play()
{
     if(replay == false)
     {
        exit();
     }

    instructions();
    computerguess();
    userguess();
    printscore();
    replay();
}

public static void main(String[] args)
{
    Hilo guess = new Hilo();
    guess.replay = true;
    guess.play();
}
}