Question

我正在尝试用java编写一个与用户一起玩hangman的程序。但是，检查字母是否正确的for循环不起作用。我很难确定原因。我正在使用的程序是Eclipse。这里只是for循环和if语句的封装（l是单词和arraylist theGuessed的长度，g是猜测的字母）：

if (theWord.contains(g))
        {

            for (int k = 0; k > l; k++)
            {

                if (g == theWord.get(k))
                {
                    theGuessed.remove(k);
                    theGuessed.add(k, g);
                    b = "true";
                    System.out.println(theGuessed);
                }
            }

以下是整个代码：

import java.util.Scanner;
import java.util.ArrayList;

public class HangMan 
{
    private static String guesses;
    private static String b; 
    private static String e; 
    private static String m;
    private static String n;
    private static String o;
    private static String p;
    private static String q;
    private static String r;

    public static void main(String[] args) 
    {
        Scanner input = new Scanner(System.in);
        ArrayList<String> theWord = new ArrayList<String>();
        ArrayList<String> theGuessed = new ArrayList<String>();

        guesses = "";
        b = "";
        e = "";
        m = "";
        n = "";
        o = "";
        p = "";
        q = "";
        r = "";


        System.out.println("Player 1, how many letters are in your word?");
        int l = input.nextInt();
        System.out.println("What is the word that Player 2 should try to guess? Type one letter at a time.");
        String d = input.nextLine();
        theWord.add(0, d);
        for (int i = 0; i< l; i++)
        {
        d = input.nextLine();
        theWord.add(i, d);
        }
        for (int j = 0; j< l; j++)
        {
            theGuessed.add(j, "_");
        }
        System.out.println(theGuessed);

        int y = 0;

        while(y == 0)
            {
        System.out.println("Player 2! What is your guess?");
        String g = input.nextLine();

        if (theWord.contains(g))
        {

            for (int k = 0; k != l; k++)
            {

                if (g == theWord.get(k))
                {
                    theGuessed.remove(k);
                    theGuessed.add(k, g);
                    b = "true";
                    System.out.println(theGuessed);
                }
            }

            if(theGuessed == theWord)
            {
                System.out.println("That's the word! You win!");
                y++;
            }
        }

        else if (m == "wrong" && n == "wrong" && o == "wrong" && p == "wrong" && q == "wrong" && r == "wrong")
        {
            System.out.println("  |");
            System.out.println("  O");
            System.out.println("/ | \\");
            System.out.println(" / \\");
            System.out.println("You lose! The word was " + theWord);
            y++;    
        }
        else if (m == "wrong" && n == "wrong" && o == "wrong" && p == "wrong" && q == "wrong")
        {
            System.out.println("  |");
            System.out.println("  O");
            System.out.println("/ | \\");
            System.out.println(" /");
            r = "wrong";
        }
        else if (m == "wrong" && n == "wrong" && o == "wrong" && p == "wrong")
        {
            System.out.println("That letter is not in the word!");
            System.out.println("  |");
            System.out.println("  O");
            System.out.println("/ | \\");
            q = "wrong";
        }
        else if (m == "wrong" && n == "wrong" && o == "wrong")
        {
            System.out.println("That letter is not in the word!");
            System.out.println("  |");
            System.out.println("  O");
            System.out.println("/ |");
            p = "wrong";
        }
        else if (m == "wrong" && n == "wrong")
        {
            System.out.println("That letter is not in the word!");
            System.out.println("  |");
            System.out.println("  O");
            System.out.println("/");
            o = "wrong";
        }
        else if (m == "wrong")
        {
            System.out.println("That letter is not in the word!");
            System.out.println("  |");
            System.out.println("  O");
            n = "wrong";
        }
        else if (b != "true")
        {
            System.out.println("That letter is not in the word!");
            System.out.println("    |");
            m = "wrong";
        }

        guesses = guesses + g + ", ";
        System.out.println("Your guesses so far: " + guesses);

        }


    }
}

我查看了几个＆＃34; for循环未输入＆＃34;在这个网站上输入问题，但我看到的所有问题都有i == x作为他们的终止要求。如你所见，这不是这种情况。

提前感谢您提供的任何帮助！

Answer 1

即使你的循环可能没有使用==，你的if条件确实使用==来比较字符串，这是一个很大的禁忌。将引用与==相等的字符串进行比较（它们是内存中完全相同的字符串吗？）。使用String#equals将得到一个正确的值（它们是否具有相同的字母序列？）比较：

if (g.equals(theWord.get(k)))

java不会输入for循环（不包括==）

1 个答案: