java - 多个扫描仪 DoWhile HiLo(10 面骰子游戏)

Question

我创建了一个游戏，打印 1 到 10 之间的随机卷号。然后系统会询问用户是否想猜测第二个卷号的较高 [1] 或较低 [2]。根据他们的猜测，系统将打印“抽奖!”、“你猜错了”。或“你猜对了。”使用两个嵌套的 if 子句可以正常工作:

public class Short {
public static void main(String args[]) {

        //roll one
        int rNum1 = (int)(Math.random() * 11); //declare random roll one,  gives result between 1 and 10

        //print roll one
        System.out.println("You roll the 10-sided die."); 
        System.out.println("It lands on " + rNum1 + ".");
        System.out.println(); //space

        //User guess
        Scanner choice = new Scanner (System.in);
        System.out.println("Will a second die roll higher or lower?");
        System.out.println("To guess higher enter [1], or to guess lower, enter [2].");

        //roll two
        int rNum2 = (int)(Math.random() * 11); //declare random roll two
        int guess = choice.nextInt(); //user's guess / HiLo

        //print roll two
        System.out.println(); //space
        System.out.println("You roll the die again."); 
        System.out.println("It lands on " + rNum2 + ".");
        System.out.println(); //space

    if (guess == 1) //guessed higher
    {
        if (rNum1 == rNum2)
        {
            System.out.println("Draw!");
        }
        else if (rNum1 > rNum2)
        {
            System.out.println("You guessed wrongly.");
        }
        else
        {
            System.out.println("You guessed correctly!");
        }
    }

    if (guess == 2) //guessed lower
    {
        if (rNum1 == rNum2)
        {
            System.out.println("Draw!");
        }
        else if (rNum1 > rNum2)
        {
            System.out.println("You guessed correctly!");
        }
        else
        {
            System.out.println("You guessed wrongly.");
        }
    }
}

不过，如果用户愿意，我想通过输入 [y] 或 [n] 为他们提供再次玩游戏的机会。我尝试使用 do-while 循环来实现声明第二个扫描仪(“重播”):

import java.util.*;
import java.util.Random; 
import java.util.Scanner;
public class Short {
public static void main(String args[]) {
    Scanner in = new Scanner (System.in);
    String replay = in.next(); //game replay scanner

    do{

        //roll one
        int rNum1 = (int)(Math.random() * 11); //declare random roll one,  gives result between 1 and 10

        //print roll one
        System.out.println("You roll the 10-sided die."); 
        System.out.println("It lands on " + rNum1 + ".");
        System.out.println(); //space

        //User guess
        Scanner choice = new Scanner (System.in);
        System.out.println("Will a second die roll higher or lower?");
        System.out.println("To guess higher enter [1], or to guess lower, enter [2].");

        //roll two
        int rNum2 = (int)(Math.random() * 11); //declare random roll two
        int guess = choice.nextInt(); //user's guess / HiLo

        //print roll two
        System.out.println(); //space
        System.out.println("You roll the die again."); 
        System.out.println("It lands on " + rNum2 + ".");
        System.out.println(); //space

    if (guess == 1) //guessed higher
    {
        if (rNum1 == rNum2)
        {
            System.out.println("Draw!");
        }
        else if (rNum1 > rNum2)
        {
            System.out.println("You guessed wrongly.");
        }
        else
        {
            System.out.println("You guessed correctly!");
        }
    }

    if (guess == 2) //guessed lower
    {
        if (rNum1 == rNum2)
        {
            System.out.println("Draw!");
        }
        else if (rNum1 > rNum2)
        {
            System.out.println("You guessed correctly!");
        }
        else
        {
            System.out.println("You guessed wrongly.");
        }
    }
    System.out.println("Would you like to play again? Enter [y] for yes.");
}while(replay == "y");
}

但是整个循环初始化为无限循环。如何使用多个扫描仪修复我的 dowhile 问题？我意识到我对java来说是个菜鸟。我是否想使用 do while 循环来允许用户在第一次运行后重播？

Answer 1

您已经很接近了，但尝试使用 nextLine() 使用扫描仪对象抓取输入，然后将输入解析为整数。然后最后询问用户是否想再次玩。

        String replay = "y";
        Scanner choice = new Scanner (System.in);
        while(replay.equals("y"))
        {

            //roll one
            int rNum1 = (int)(Math.random() * 11); //declare random roll one,  gives result between 1 and 10

            //print roll one
            System.out.println("You roll the 10-sided die."); 
            System.out.println("It lands on " + rNum1 + ".");
            System.out.println(); //space

            //User guess
            System.out.println("Will a second die roll higher or lower?");
            System.out.println("To guess higher enter [1], or to guess lower, enter [2].");

            //roll two
            int rNum2 = (int)(Math.random() * 11); //declare random roll two
            int guess = Integer.parseInt(choice.nextLine()); //user's guess / HiLo

            //print roll two
            System.out.println(); //space
            System.out.println("You roll the die again."); 
            System.out.println("It lands on " + rNum2 + ".");
            System.out.println(); //space

            if (guess == 1) //guessed higher
            {
                if (rNum1 == rNum2)
                {
                    System.out.println("Draw!");
                }
                else if (rNum1 > rNum2)
                {
                    System.out.println("You guessed wrongly.");
                }
                else
                {
                    System.out.println("You guessed correctly!");
                }
            }

            if (guess == 2) //guessed lower
            {
                if (rNum1 == rNum2)
                {
                    System.out.println("Draw!");
                }
                else if (rNum1 > rNum2)
                {
                    System.out.println("You guessed correctly!");
                }
                else
                {
                    System.out.println("You guessed wrongly.");
                }
            }
            System.out.println("Would you like to play again? Enter [y] for yes.");
            replay = choice.nextLine();
        }