Question

我是Java的新手并且有一个问题。我的程序是一个简单的计算机猜谜游戏。如果你猜对了，那么你的积分会向上移动1.如果猜错了，那么你的积分会减少1.如果你得到7或0，那么你输赢。你能帮我理解为什么它不会循环回到while语句的起始位置吗？谢谢！

import java.util.Random;
import java.util.Scanner;
import java.lang.Math;
import java.io.*;

class RandomGame {
public static void main(String str[]) throws IOException {
    Scanner scan = new Scanner(System.in);
    String userAns = new String();
    Random generator = new Random();

    int guess, num, points = 0;

    System.out.println("Hello...");
    try {
        Thread.sleep(1500);
    } catch (InterruptedException ex) {
    }
    System.out.println("Would you consider playing a fun game?");
    try {
        Thread.sleep(1000);
    } catch (InterruptedException ex) {
    }
    userAns = scan.next();
    // if/else about whether they want to play the game**********
    if (userAns.equals("yes")) {
        System.out.println("Awww yeah lets get going!");
        System.out
                .println("Objective of the game:\n1.Guess numbers out of 5\n2."
                        + "If you guess incorrect you get points reduced.\n3.Have fun!");

        try {
            Thread.sleep(5500);
        } catch (InterruptedException ex) {
        }
        System.out.println("\nReady?");
        userAns = scan.next();
        if (userAns.equals("yes")) {
            System.out.println("Okay! Here we go!");
            // COUNTDOWN************************************
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ex) {
            }
            System.out.println("3");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ex) {
            }
            System.out.println("2");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ex) {
            }
            System.out.println("1");
        }
        try {
            Thread.sleep(1000);
        } catch (InterruptedException ex) {
        }

        // *****************************************************
        System.out.println("Please enter a integer 1-5 to start the game.");

        guess = scan.nextInt();
        num = generator.nextInt(5) + 1;
        while (points <= 7 && points >= 0)

        {
            if (guess == num) {
                System.out.println("Correct! You gained 1 point!");
                points++;
                System.out.println(points);
            } else if (guess != num) {
                System.out.println("Incorrect. You lose 1 point.");
                points--;

            }
        }

    }

    else if (userAns.equals("no")) {
        System.out.println("GAMEOVER.\n\n\nHint: say \"yes\"");
    }

    else {
        System.out.print("yes or no answers please.");
    }
}
}

Answer 1

你的代码会循环回到while循环开始的地方，它只是在下一个猜测中没有读取，因为你从用户输入的读取是在循环之外。这两行必须在循环内

guess = scan.nextInt();
num = generator.nextInt(5) + 1;

目前，您的代码读入一个int并生成一个。如果猜测正确，你将获得7分然后获胜，如果错误你将立即失去

Answer 2

如果你第一次得到错误答案，你的积分将变为-1。

while (points <= 7 && points >= 0)

检查范围仅在0到7之间，因此它退出循环

Answer 3

你的while循环不会等待nextInt()，所以循环只是根据第一个猜测增加或减少。要解决这个问题，请在进行计算之前等待下一个输入，然后在循环中进行计算：

while ((points <= 7 && points >= 0) && scan.hasNext()) {
  // we have an input value
  guess = scan.nextInt();
  num = generator.nextInt(5) + 1;
}

Answer 4

在while循环中输入用户输入

  while (points <= 7 && points >= 0)
  {
      guess = scan.nextInt();
      num = generator.nextInt(5) + 1;
      // continue 

  }

为什么我的while循环会冻结我的程序以及如何修复它？

4 个答案: