为什么我的图形更新不会？

Question

因此，我正在为我的高中计算机科学课程创建一个简单的程序，涉及图形，并且我无法使图形实际绘制和更新。在JPanel上，我想要绘制hang子手的一部分，因为用户无法猜测正确的字母/单词以及沿途显示和更新神秘字词（即h-ll-，单词是hello）。在终端上用户将输入他们的猜测。

现在我已经把它设置为只是绘制随机线。唯一的问题是它没有绘制它们。我不知道我做错了什么。

这里是的刽子手代码：

import java.util.Scanner; 
import java.awt.event.*; 
import java.awt.*; 
import javax.swing.*; 
import java.util.ArrayList; 
public class Hangman extends JPanel 
{ 
    private String mysteryWord; //The hidden word "----" 
    private String word; //The word to be guessed 
    private ArrayList<String> bank; //List of words to be guessed 
    private ArrayList<String> incorrect; //List of wrong guesses the user has made 
    private int guesses; //Number of guesses 
    private int drawing; //determines what to draw 
    /** 
    * Creates a Hangman object. word is the word to be guessed and mysteryWord is 
    * the word with all characters replaced with a blank "_" 
    */ 
    public Hangman() 
    { 
     drawing = 0; 
     guesses = 11; 
     bank = new ArrayList<String>(); 
     incorrect = new ArrayList<String>(); 
     bank.add("Spain");bank.add("France");bank.add("Germany");bank.add("Vietnam");bank.add("Italy");bank.add("Portugal");bank.add("United States"); 
     bank.add("Argentina");bank.add("Canada");bank.add("Mexico");bank.add("China");bank.add("Japan");bank.add("Somalia"); 
     bank.add("Soccer");bank.add("Football");bank.add("Baseball");bank.add("Tennis");bank.add("Basketball");bank.add("Games"); 
     bank.add("One"); 
     int random = (int)(Math.random() * bank.size()); 
     word = bank.get(random); 
     mysteryWord = ""; 
     for(int i = 0; i < word.length(); i++) 
     { 
      mysteryWord = mysteryWord + "-"; 
     } 
    } 

    /** 
    * Creates a Hangman object. The word to be guessed is a word chosen by the used and the mysteryWord is the chosen 
    * word with all characters replaced with a "-"; 
    */ 
    public Hangman(String str) 
    { 
     guesses = 11; 
     incorrect = new ArrayList<String>(); 
     word = str; 
     mysteryWord = ""; 
     for(int i = 0; i < str.length(); i++) 
     { 
      mysteryWord = mysteryWord + "-"; 
     } 
    } 

    /** 
    * Sets the number of guesses 
    */ 
    public void setGuesses(int x) 
    { 
     guesses = x; 
    } 

    /** 
    * Returns the number of guesses 
    */ 
    public int getGuesses() 
    { 
     return guesses; 
    } 

    /** 
    * Makes a guess. The guessed word must have a length of 1, guessing one character or 
    * have a length of the hidden word, guessing the whole word 
    */ 
    public boolean makeGuess(String guess) 
    { 
     String updatedStr = ""; 
     String str = guess; 
     boolean status = false; 
     if(guess.length() == 0 || guess.length() > 1 && guess.length() < word.length() || guess.length() > word.length()) 
     { 
       System.out.println("You can only guess 1 letter or the whole word"); 
       updatedStr = mysteryWord; 
       incorrect.add(guess); 
     } 
     else if(guess.length() == 1) 
     { 
      for(int i = 0; i < word.length(); i++) 
      { 
       if(word.substring(i,i+1).equalsIgnoreCase(guess)) 
       { 
        updatedStr += guess; 
        status = true; 
       } 
       else 
       { 
        updatedStr += mysteryWord.substring(i,i+1); 
       } 
      } 
      if(status == false) 
      { 
       incorrect.add(guess); 
      } 
     } 
     else if(guess.equalsIgnoreCase(word)) 
     { 
      status = true; 
      updatedStr = word; 
      guesses = 0; 
     } 
     else 
     { 
      updatedStr = mysteryWord; 
      incorrect.add(guess); 
     } 
     guesses--; 
     mysteryWord = updatedStr; 
     return status; 
    } 

    /** 
    * Returns whether or not the user's guessed string is equal to the hidden word 
    */ 
    public boolean isEqual() 
    { 
     if(mysteryWord.equalsIgnoreCase(word)) 
     { 
      return true; 
     } 
     return false; 
    } 

    public String getIncorrectGuesses() 
    { 
     String wrong = ""; 
     for(int i = 0; i < incorrect.size(); i++) 
     { 
      wrong = wrong + (incorrect.get(i) + ", "); 
     } 
     return wrong; 
    } 

    /** 
    * Returns the word the user has been guessing 
    */ 
    public String getMWord() 
    { 
     return mysteryWord; 
    } 

    /** 
    * Returns the word the user is trying to guess 
    */ 
    public String getWord() 
    { 
     return word; 
    } 

    public void paintComponent(Graphics g) 
    { 
     super.paintComponent(g); 
     this.setBackground(Color.WHITE); 
     g.setColor(Color.BLACK); 
     g.drawString(mysteryWord, 25, 120); 
     switch(drawing) 
     { 
      case 1: g.drawLine(23, 150, 200, 150);break; 
      case 2: g.drawLine(23, 150, 250, 150);break; 
      case 3: g.drawLine(23, 150, 300, 150);break; 
      case 4: g.drawLine(23, 150, 800, 150);break; 
      case 5: g.drawLine(23, 150, 70, 150);break; 
      case 6: g.drawLine(23, 150, 40, 150);break; 
      case 7: g.drawLine(23, 150, 10, 150);break; 
      case 8: g.drawLine(23, 150, 50, 150);break; 
      case 9: g.drawLine(23, 150, 20, 150);break; 
      case 10: g.drawLine(23, 150, 90, 150);break; 
      case 11: g.drawLine(23, 200, 200, 150);break; 
     } 
    } 

    public void playHangman() 
    { 
     Scanner kb = new Scanner(System.in); 
     System.out.println("Time to play Hangman!"); 
     System.out.println("Would you like to use your own word? Yes or no?"); 
     String play = kb.nextLine(); 
     if(play.equalsIgnoreCase("yes")) 
     { 
      System.out.println("What word would you like to use?"); 
      String word = kb.nextLine(); 
      Hangman test = new Hangman(word); 
      boolean status = false; 
      while(test.getGuesses() > 0) 
      { 
       System.out.println("Progress: " + test.getMWord()); 
       System.out.println("Guesses: " + test.getGuesses()); 
       System.out.println("Incorrect: " + test.getIncorrectGuesses()); 
       System.out.print("Guess a character or word: "); 
       String guess = kb.nextLine(); 
       if(test.makeGuess(guess) == true) 
       { 
        System.out.println("Correct!"); 
       } 
       else 
       { 
        System.out.println("Wrong!"); 
        drawing++; 
       } 
       if(test.isEqual() == true) 
       { 
        test.setGuesses(0); 
        status = true; 
       } 
      } 
      if(status == true) 
      { 
       System.out.println("Progress: " + test.getMWord()); 
       System.out.println("The hidden word was: " + test.getWord()); 
       System.out.println("Congratulations you win!"); 
      } 
      else 
      { 
       System.out.println("Progress: " + test.getMWord()); 
       System.out.println("You lost... better luck next time!"); 
       System.out.println("The hidden word was: " + test.getWord()); 
      } 
     } 
     else 
     { 
      Hangman test = new Hangman(); 
      boolean status = false; 
      while(test.getGuesses() > 0) 
      { 
       System.out.println("Progress: " + test.getMWord()); 
       System.out.println("Guesses: " + test.getGuesses()); 
       System.out.println("Incorrect: " + test.getIncorrectGuesses()); 
       System.out.print("Guess a character or word: "); 
       String guess = kb.nextLine(); 
       if(test.makeGuess(guess) == true) 
       { 
        System.out.println("Correct!"); 
       } 
       else 
       { 
        System.out.println("Wrong!"); 
        drawing++; 
       } 
       if(test.isEqual() == true) 
       { 
        test.setGuesses(0); 
        status = true; 
       } 
      } 
      if(status == true) 
      { 
       System.out.println("Progress: " + test.getMWord()); 
       System.out.println("Congratulations you win!"); 
      } 
      else 
      { 
       System.out.println("Progress: " + test.getMWord()); 
       System.out.println("You lost... better luck next time!"); 
       System.out.println("The hidden word was: " + test.getWord()); 
      } 
     } 
    } 
} 

这是用户将运行玩游戏

import javax.swing.*; 
import java.util.Scanner; 
public class Tester 
{ 
    public static void main(String [] args) 
    { 
     Hangman player = new Hangman(); 
     JFrame window = new JFrame("Hangman"); 
     window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     window.setSize(500,300); 
     window.add(player); 
     window.setVisible(true); 
     player.playHangman(); 
    } 
} 

最后，我将修改我的代码类，所以，唯一的事情，这将在终端上出现的是要求用户猜测和接收的程序，并通知用户他们的猜测是否正确。但首先，我必须让我的线条真实地画出来，因为用户做出了一个错误的猜测。

Answer 1

一切都在主（事件调度），螺纹等图形 没有机会做任何事情，因为你总是阻止 等待输入。概念上使用控制台给 图形程序提供输入是不好的。 - John3136

我很确定John3136说得没错。你最好是通过框架内的摆动部件或不同的部件接受来自用户的输入。

如果您仍然希望使用控制台进行输入，请调用paintComponent()方法的结束方法中的repaint（）方法。我试过了，它对我来说工作得很好。

Answer 2

当你想更新图形（打电话给你的paintComponent方法），调用repaint();