Java Pongゲームのヘルプ。私のキーの動きや一時停止ボタンに反応しないパドルに関する奇妙なバグは、うまくいきません。

Question

何かの理由で、プレイヤー1のパドルが画面の一番下にくると、ゲームが始まります。両方のプレーヤーがフリーズしてキーボード入力に応答しなくなり、一時停止ボタンも機能しなくなります。しかし、何も起こっていないかのように、ボールは動き続けて壁やパドルから跳ね返ります。私はまず、パネルがフォーカスを失う問題であると思って、パネルがフォーカスを失った場合にフォーカスを直ちに取得するようにfocusListenerを追加しました。しかし、それはこの奇妙なバグを修正しませんでした。オンラインでリサーチをした後、KeyListenerに何か問題があったと思ったので、キーバインドを使用するように変更しました。しかし、それでもうまくいきませんでした、そして今、私は困っており、あなたの助けが必要です。また、2つのプレーヤー機能を追加する前に、私のポンゲームはシングルプレイヤーゲームであり、このバグはありませんでした。しかし、単一のラケットは、上下のキーで制御されていました。私はそれが多くのコードだと知っていますが、どんな助けも大歓迎です。 PongPanelクラス が

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.sound.sampled.*; 
import java.net.*; 
//public class PongPanel extends JPanel implements KeyListener, ActionListener, FocusListener 
public class PongPanel extends JPanel implements ActionListener, FocusListener 
{ 
    //Instance variables 
    private int playerScore, player2Score, numberOfTimesResumed, numberOfTimesPaused; 
    private HumanRacket r1; 
    private Ball b1; 
    private ComputerRacket r2; 
    private HumanRacket r3; 
    private boolean gameRunning, playerWin, player2Win, gamePaused, onePlayerGame, twoPlayerGame; 
    private Timer timer; 
    private Font font; 
    private int ballBounces; 
    private JButton playerVsPlayerButton, playerVsComputerButton; 
    //Constructor; 
    public PongPanel() 
    { 
     playerScore = 0; 
     ballBounces = 0; 
     player2Score = 0; 
     gameRunning = false; 
     playerWin = false; 
     player2Win = false; 
     gamePaused = false; 
     font = new Font("Courier", Font.BOLD, 16); 
     setBackground(Color.black); 
     r1 = new HumanRacket(20, 210); 
     b1 = new Ball(); 
     r2 = new ComputerRacket(b1); 
     r3 = new HumanRacket(660,210); 
     playerVsPlayerButton = new JButton("Two Player"); 
     playerVsPlayerButton.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       twoPlayerGame = true; 
       gameRunning = true; 
      } 
     }); 
     playerVsComputerButton = new JButton("One Player"); 
     playerVsComputerButton.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       onePlayerGame = true; 
       gameRunning = true; 
      } 
     }); 
     playerVsPlayerButton.setBackground(Color.WHITE); 
     playerVsComputerButton.setBackground(Color.WHITE); 
     playerVsPlayerButton.setFocusable(false); 
     playerVsComputerButton.setFocusable(false); 
     timer = new Timer(33, this); 
     timer.start(); 
     //this.addKeyListener(this); 
     this.addFocusListener(this); 
     this.add(playerVsPlayerButton); 
     this.add(playerVsComputerButton); 
     //Key Bindings for keys that are pressed 
     this.addKeyBindingPressed(KeyEvent.VK_W, "Player 1 paddle move up", (evt) ->{ 
      r1.setUpAccel(true); 
     }); 
     this.addKeyBindingPressed(KeyEvent.VK_S, "Player 1 paddle move down", (evt) -> { 
      r1.setDownAccel(true); 
     }); 
     this.addKeyBindingPressed(KeyEvent.VK_P, "Pause Game", (evt) ->{ 
      if(!gamePaused && gameRunning) { 
       gamePaused = true; 
       this.pause(); 
       numberOfTimesPaused++; 
       repaint(); 
      }//end of if 
     }); 
     this.addKeyBindingPressed(KeyEvent.VK_R, "Resume Game", (evt) -> { 
      if(numberOfTimesResumed < numberOfTimesPaused) 
      { 
       this.resume(); 
       gamePaused = false; 
       numberOfTimesResumed++; 
      }//end of if 
     }); 
     this.addKeyBindingPressed(KeyEvent.VK_UP, "Player 2 paddle move up", (evt) ->{ 
      r3.setUpAccel(true); 
     }); 
     this.addKeyBindingPressed(KeyEvent.VK_DOWN, "Player 2 paddle move down", (evt) ->{ 
      r3.setDownAccel(true); 
     }); 
     //Key bindings for keys that are released 
     this.addKeyBindingReleased(KeyEvent.VK_W, "Player 1 paddle stop moving up", (evt) ->{ 
      r1.setUpAccel(false); 
     }); 
     this.addKeyBindingReleased(KeyEvent.VK_S, "Player 1 paddle stop moving down", (evt) ->{ 
      r1.setDownAccel(false); 
     }); 
     this.addKeyBindingReleased(KeyEvent.VK_UP, "Player 2 paddle stop moving up", (evt) ->{ 
      r3.setUpAccel(false); 
     }); 
     this.addKeyBindingReleased(KeyEvent.VK_DOWN, "Player 2 paddle stop moving down", (evt) ->{ 
      r3.setDownAccel(false); 
     }); 
    }//end of constructor 
    public void paintComponent(Graphics g) 
    { 
     super.paintComponent(g); 
     if(gameRunning) 
     { 
      this.remove(playerVsPlayerButton); 
      this.remove(playerVsComputerButton); 
     }//end of if 
     if(gameRunning == false && playerWin == false && player2Win == false) 
     { 
      g.setColor(Color.white); 
      g.setFont(font); 
      g.drawString("Table Tennis ", 300, 100); 
      g.drawString("Score 5 to win", 290, 130); 
      g.drawString("Player 1 uses W and S keys to move", 190, 160); 
      g.drawString("Player 2 uses up and down keys to move", 200, 190); 
      g.drawString("Press P to Pause and R to Resume", 210, 220); 
      g.drawString("Created by: Tae-young Kim ", 0, 465); 
     }//end of if 
     else if(playerWin == true) 
     { 
      if(onePlayerGame) 
      { 
       g.setColor(Color.white); 
       g.setFont(font); 
       g.drawString("You Win!", 315, 100); 
      } 
      else if(twoPlayerGame) 
      { 
       g.setColor(Color.white); 
       g.setFont(font); 
       g.drawString("Player 1 Wins!", 310, 100); 
      } 
     }//end of if 
     else if(player2Win == true) 
     { 
      if(onePlayerGame) 
      { 
       g.setColor(Color.white); 
       g.setFont(font); 
       g.drawString("Game Over", 315, 100); 
      } 
      else if(twoPlayerGame) 
      { 
       g.setColor(Color.white); 
       g.setFont(font); 
       g.drawString("Player 2 Wins", 310, 100); 
      } 
     }//end of if 
     else if(gamePaused) 
     { 
      g.setColor(Color.white); 
      g.setFont(font); 
      g.drawString("Game Paused", 310, 100); 
      g.drawString("Press R to resume", 300, 130); 
     }//end of else if 
     //Prints out player score 
     g.setColor(Color.white); 
     g.setFont(font); 
     g.drawString(String.valueOf(playerScore), 50 , 40); 
     g.drawString(String.valueOf(player2Score), 640, 40); 
     r1.paint(g); 
     b1.paint(g); 
     if(onePlayerGame) 
     { 
      r2.paint(g); 
     } 
     else if(twoPlayerGame) 
     { 
      r3.paint(g); 
     } 
    }//end of paintComponent method 
    /*public void keyPressed(KeyEvent e) 
    { 
     if(e.getKeyCode() == KeyEvent.VK_UP) 
     { 
      r3.setUpAccel(true); 
     }//end of if 
     if(e.getKeyCode() == KeyEvent.VK_DOWN) 
     { 
      r3.setDownAccel(true); 
     }//end of else if 
     if(e.getKeyCode() == KeyEvent.VK_P) 
     { 
      if(!gamePaused && gameRunning) { 
       gamePaused = true; 
       this.pause(); 
       numberOfTimesPaused++; 
       repaint(); 
      }//end of if 
     }//end of else if 
     if(e.getKeyCode() == KeyEvent.VK_R) 
     { 
      if(numberOfTimesResumed < numberOfTimesPaused) 
      { 
       this.resume(); 
       gamePaused = false; 
       numberOfTimesResumed++; 
      }//end of if 
     }//end of else if 
     if(e.getKeyCode() == KeyEvent.VK_W) 
     { 
      r1.setUpAccel(true); 
     } 
     if(e.getKeyCode() == KeyEvent.VK_S) 
     { 
      r1.setDownAccel(true); 
     } 
    }//end of keyPressed method 
    @Override 
    public void keyReleased(KeyEvent e) 
    { 
     if(e.getKeyCode() == KeyEvent.VK_UP) 
     { 
      r3.setUpAccel(false); 
     }//end of if 
     if(e.getKeyCode() == KeyEvent.VK_DOWN) 
     { 
      r3.setDownAccel(false); 
     }//end of else if 
     if(e.getKeyCode() == KeyEvent.VK_W) 
     { 
      r1.setUpAccel(false); 
     } 
     if(e.getKeyCode() == KeyEvent.VK_S) 
     { 
      r1.setDownAccel(false); 
     } 
    }//end of keyReleased method 
    public void keyTyped(KeyEvent e) 
    { 
     //Method not useful for this program 
    }//end of keyTyped method*/ 
    public void actionPerformed(ActionEvent e) 
    { 
     if(gameRunning) 
     { 
      r1.move(); 
      b1.move(); 
      if(onePlayerGame) 
      { 
       r2.move(); 
      } 
      else if(twoPlayerGame) 
      { 
       r3.move(); 
      } 
      b1.increaseSpeed(ballBounces); 
      this.checkBallRacketCollision(); 
      this.addScore(); 
      this.checkForWin(); 
      repaint(); 
      this.endGameIfOver(); 
     }//end of if 
    }//end of actionPerformed method 
    public void checkBallRacketCollision() 
    { 
     if(b1.getXPos() <= r1.getX() + 1) 
     { 
      if(b1.getYPos() >= r1.getY() && b1.getYPos() <= r1.getY() + 80) 
      { 
       b1.setXVel(b1.getXVel() * -1); 
       ballBounces++; 
       playBounceSound(); 
      }//end of if 
     }//end of if 
     if(onePlayerGame) 
     { 
      if(b1.getXPos() +15 >= r2.getX()) 
      { 
       if((b1.getYPos() + 7) >= r2.getY() && b1.getYPos() <= r2.getY() + 80) 
       { 
        b1.setXVel(b1.getXVel() * -1); 
        ballBounces++; 
        playBounceSound(); 
       }//end of if 
      }//end of if 
     } 
     else if(twoPlayerGame) 
     { 
      if(b1.getXPos() + 15 >= r3.getX()) 
      { 
       if((b1.getYPos() + 7) >= r3.getY() && b1.getYPos() <= r3.getY() + 80) 
       { 
        b1.setXVel(b1.getXVel() * -1); 
        ballBounces++; 
        playBounceSound(); 
       } 
      } 
     } 
    }//end of checkBallRacketCollsion method 
    public void addScore() 
    { 
     if(b1.getXPos() < 1) 
     { 
      player2Score++; 
      playScoreSound(); 
      b1.setXPos(350); 
      b1.setYPos(250); 
      b1.generateRandomXVelocity(); 
      b1.generateRandomYVelocity(); 
      this.pause(); 
      this.resumeDelay(); 
      b1.setSpeedIncreaseBoolean(true); 
      ballBounces = 0; 
     }//end of if 
     //If ball is behind racket end the round 
     else if(b1.getXPos() > 0 && b1.getXPos() < r1.getX() -10) 
     { 
      if(b1.getYPos() > r1.getY() && b1.getYPos() < (r1.getY() + 80)) 
      { 
       player2Score++; 
       playScoreSound(); 
       b1.setXPos(350); 
       b1.setYPos(250); 
       b1.generateRandomXVelocity(); 
       b1.generateRandomYVelocity(); 
       this.pause(); 
       this.resumeDelay(); 
       b1.setSpeedIncreaseBoolean(true); 
       ballBounces = 0; 
      }//end of if 
     }//end of else if 
     if(b1.getXPos() > 699) 
     { 
      playerScore++; 
      playScoreSound(); 
      b1.setXPos(350); 
      b1.setYPos(250); 
      b1.generateRandomXVelocity(); 
      b1.generateRandomYVelocity(); 
      this.pause(); 
      this.resumeDelay(); 
      b1.setSpeedIncreaseBoolean(true); 
      ballBounces = 0; 
     }//end of if 
     //If ball is behind computer racket end the round 
     if(onePlayerGame) 
     { 
      if(b1.getXPos() > (r2.getX() + 10) && b1.getXPos() < 700) 
     { 
      if(b1.getYPos() > r2.getY() && b1.getYPos() < (r2.getY() + 80)) 
      { 
       playerScore++; 
       playScoreSound(); 
       b1.setXPos(350); 
       b1.setYPos(250); 
       b1.generateRandomXVelocity(); 
       b1.generateRandomYVelocity(); 
       this.pause(); 
       this.resumeDelay(); 
       b1.setSpeedIncreaseBoolean(true); 
       ballBounces = 0; 
      }//end of if 
     }//end of else if 
     } 
     if(twoPlayerGame) 
     { 
      if(b1.getXPos() > (r3.getX() + 10) && b1.getXPos() < 700) 
      { 
       if(b1.getYPos() > r3.getY() && b1.getYPos() < (r3.getY() + 80)) 
       { 
        playerScore++; 
        playScoreSound(); 
        b1.setXPos(350); 
        b1.setYPos(250); 
        b1.generateRandomXVelocity(); 
        b1.generateRandomYVelocity(); 
        this.pause(); 
        this.resumeDelay(); 
        b1.setSpeedIncreaseBoolean(true); 
        ballBounces = 0; 
       } 
      } 
     } 
    }//end of addScore method 
    public void pause() 
    { 
     this.timer.stop(); 
    }//end of pause method 
    public void resumeDelay() 
    { 
     this.timer = new Timer(33,this); 
     timer.setInitialDelay(1500); 
     timer.start(); 
    }//end of resume method 
    public void resume() 
    { 
     this.timer = new Timer(33,this); 
     timer.start(); 
    }//end of resume 
    public void checkForWin() 
    { 
     if(playerScore == 5) 
     { 
      playerWin = true; 
      gameRunning = false; 
     }//end of if 
     else if(player2Score == 5) 
     { 
      player2Win = true; 
      gameRunning = false; 
     }//end of if 
    }//end of checkForWin method 
    public void endGameIfOver() 
    { 
     if(playerWin || player2Win) 
     { 
      this.timer.stop(); 
     }//end of if 
    }//end of endGameIfOver method 
    public void playBounceSound() 
    { 
     try { 
      URL soundURL1 = getClass().getClassLoader().getResource("audio/pong sound effect 2.wav"); 
      AudioInputStream ais = AudioSystem.getAudioInputStream(soundURL1); 
      Clip clip = AudioSystem.getClip(); 
      clip.open(ais); 
      clip.start(); 
     } catch(Exception ex) { 
      System.out.println("Error with playing bounce sound."); 
      ex.printStackTrace(); 
     } 
    }//end of playBounceSound method 
    public void playScoreSound() 
    { 
     try 
     { 
      URL soundURL2 = getClass().getClassLoader().getResource("audio/Pong Sound effect 1.wav"); 
      AudioInputStream ais2 = AudioSystem.getAudioInputStream(soundURL2); 
      Clip clip1 = AudioSystem.getClip(); 
      clip1.open(ais2); 
      clip1.start(); 
     }//end of try 
     catch(Exception e) 
     { 
      System.out.println("Error with playing score sound."); 
      e.printStackTrace(); 
     }//end of catch 
    }//end of playScoreSound method 
    public void focusGained(FocusEvent e) 
    { 

    } 
    @Override 
    public void focusLost(FocusEvent e) { 
     this.requestFocusInWindow(); 
    } 
    public void addKeyBindingPressed(int keyCode, String description, ActionListener action) 
    { 
     InputMap im = this.getInputMap(this.WHEN_IN_FOCUSED_WINDOW); 
     ActionMap am = this.getActionMap(); 
     im.put(KeyStroke.getKeyStroke(keyCode, 0, false), description); 
     am.put(description, new AbstractAction() 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       action.actionPerformed(e); 
      } 
     }); 
    } 
    public void addKeyBindingReleased(int keyCode1, String description1, ActionListener action1) 
    { 
     InputMap im1 = this.getInputMap(this.WHEN_IN_FOCUSED_WINDOW); 
     ActionMap am1 = this.getActionMap(); 
     im1.put(KeyStroke.getKeyStroke(keyCode1,0,true), description1); 
     am1.put(description1, new AbstractAction() 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       action1.actionPerformed(e); 
      } 
     }); 
    } 
}//end of PongPanel class 

メインクラス

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 
public class TableTennis 
{ 
    private final static int WIDTH = 700, HEIGHT = 500; 
    private JFrame window = new JFrame(); 
    //Constructor 
    public TableTennis() 
    { 
     window.setTitle("Table Tennis"); 
     window.setSize(WIDTH,HEIGHT); 
     window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     window.setResizable(false); 
     //Centers the window on the screen 
     window.setLocationRelativeTo(null); 
     PongPanel panel = new PongPanel(); 
     Container pane = window.getContentPane(); 
     pane.add(panel); 
     /*panel.addFocusListener(new FocusAdapter() 
     { 
      public void focusLost(FocusEvent ev) 
      { 
       panel.requestFocus(); 
      } 
     });*/ 
     panel.setFocusable(true); 
     panel.requestFocusInWindow(); 
     window.setVisible(true); 
    }//end of constructor 
    public static void main(String [] args) 
    { 
     new TableTennis(); 
    }//end of main 
}//end of class 

ありがとうボールクラス

import javax.swing.*; 
import java.awt.*; 
import java.util.*; 
public class Ball 
{ 
    private int x, y, xVel, yVel; 
    private boolean speedIncrease; 
    public Ball() 
    { 
     speedIncrease = true; 
     x = 350; 
     y = 250; 
     xVel = generateRandomXVelocity(); 
     yVel = generateRandomYVelocity(); 
    }//end of Ball constructor 
    public void paint(Graphics g) 
    { 
     g.setColor(Color.white); 
     g.fillOval(x,y,15,15); 
    }//end of paint method 
    public void move() 
    { 
     x += xVel; 
     y += yVel; 
     if(y < 10) 
     { 
      yVel *= -1; 
     }//end of if 
     else if(y > 460) 
     { 
      yVel *= -1; 
     }//end of if 
    }//end of move method 
    public int getXPos() 
    { 
     return x; 
    }//end of getXPos method 
    public int getYPos() 
    { 
     return y; 
    }//end of getYPos method 
    public void setXVel(int xVelocity) 
    { 
     xVel = xVelocity; 
    }//end of setXVel method 
    public int getXVel() 
    { 
     return xVel; 
    }//end of getXVel method 
    public int getYVel() 
    { 
     return yVel; 
    }//end of getYVel method 
    public int generateRandomXVelocity() 
    { 
     Random generator = new Random(); 
     xVel = (generator.nextInt(2) + 6) * getRandomDirection(); 
     return xVel; 
    }//end of generateRandomXVelocity method 
    public int generateRandomYVelocity() 
    { 
     Random generator = new Random(); 
     yVel = generator.nextInt(2) + 6; 
     return yVel; 
    }//end of generateRandomYVelocity method 
    public int getRandomDirection() 
    { 
     Random generator = new Random(); 
     int rand = generator.nextInt(2); 
     if(rand == 0) 
     { 
      return 1; 
     }//end of if 
     else 
     { 
      return -1; 
     }//end of else 
    }//end of getRandomDirection method 
    public void setXPos(int xPosition) 
    { 
     x = xPosition; 
    }//end of setXPos method 
    public void setYPos(int yPosition) 
    { 
     y = yPosition; 
    }//end of setYPos method 
    public void increaseSpeed(int ballBounces) 
    { 
     if(ballBounces == 3 && speedIncrease) 
     { 
      if(xVel > 0 && yVel > 0) 
      { 
       xVel+=3; 
       yVel+=3; 
       speedIncrease = false; 
      }//end of if 
      else if(xVel >0 && yVel < 0) 
      { 
       xVel+=3; 
       yVel-=3; 
       speedIncrease = false; 
      }//end of else if 
      else if(xVel <0 && yVel > 0) 
      { 
       xVel-=3; 
       yVel+=3; 
       speedIncrease = false; 
      }//end of else if 
      else 
      { 
       xVel-=3; 
       yVel-=3; 
       speedIncrease = false; 
      }//end of else 
     }//end of if 
    }//end of increaseSpeed 
    public void setSpeedIncreaseBoolean(boolean incomingInput) 
    { 
     speedIncrease = incomingInput; 
    }//end of setSpeedIncreaseBoolean method 
}//end of class 

ラケットインタフェース

import java.awt.*; 
public interface Racket 
{ 
    public void paint(Graphics g); 
    public void move(); 
    public int getY(); 
}//end of interface 

HumanRacketクラス

import java.awt.*; 
public class HumanRacket implements Racket 
{ 
    //Instance variables 
    private final double GRAVITY = 0.95; 
    private int x,y; 
    private double yVel; 
    private boolean upAccel, downAccel; 
    //Constructor 
    public HumanRacket(int xLoc, int yLoc) 
    { 
     x = xLoc; 
     y = yLoc; 
     yVel = 0; 
     upAccel = false; 
     downAccel = false; 
    }//end of constructor 
    //Methods 
    public void paint(Graphics g) 
    { 
     g.setColor(Color.white); 
     g.fillRect(x,y,1,80); 
    }//end of draw method 
    public void move() 
    { 
     if(upAccel) 
     { 
      yVel -= 4; 
      //Caps the speed at a certain point 
      if(yVel < -12) 
      { 
       yVel = -12; 
      }//end of if 
     }//end of if 
     else if(downAccel) 
     { 
      yVel += 4; 
      //Caps the speed at a certain point 
      if(yVel > 12) 
      { 
       yVel = 12; 
      }//end of if 
     }//end of else if 
     else if(!upAccel && !downAccel) 
     { 
      yVel *= GRAVITY; 
     }//end of else if 
     y += yVel; 
     //Prevents racket from leaving screen 
     if(y > 390) 
     { 
      y = 390; 
     }//end of if 
     else if(y < 0) 
     { 
      y = 0; 
     }//end of else if 
    }//end of move method 
    public void setUpAccel(boolean input) 
    { 
     upAccel = input; 
    }//end of setUpAccel method 
    public void setDownAccel(boolean input) 
    { 
     downAccel = input; 
    }//end of setDownAccel method 
    public int getY() 
    { 
     return y; 
    }//end of getY accessor method 
    public int getX() 
    { 
     return x; 
    }//end of getX accessor method 
}//end of class 

ComputerRacketクラス

import java.awt.*; 
import javax.swing.*; 
import java.util.*; 
public class ComputerRacket implements Racket 
{ 
    private int x, y; 
    private double yVel; 
    private int HALFWAY_POINT = 350; 
    Random generator; 
    Ball b1; 
    public ComputerRacket(Ball whiteBall) 
    { 
     x = 660; 
     y = 210; 
     b1 = whiteBall; 
     generator = new Random(); 
     yVel = 0; 
    }//end of constructor 
    public void paint(Graphics g) 
    { 
     g.setColor(Color.white); 
     //g.fillRect(x,y,20,80); 
     g.fillRect(x,y,1,80); 
    }//end of paint method 
    public void move() 
    { 
     this.setYVel(Math.abs(b1.getYVel())); 
     int randomelyGeneratedNum = generateRandomNumber(); 
     if(b1.getXPos() >= HALFWAY_POINT) 
     { 
      if(randomelyGeneratedNum == 0 || randomelyGeneratedNum == 1 || randomelyGeneratedNum == 2) 
      { 
       if(b1.getYPos() > y + 40) 
       { 
        y += yVel; 
       }//end of if 
       else 
       { 
        y -= yVel; 
       }//end of else 
      }//end of if 
      else if(randomelyGeneratedNum == 3)//Overcorrect 
      { 
       if(b1.getYPos() > y + 40) 
       { 

        y += yVel + 2; 
       }//end of if 
       else 
       { 
        y -= yVel + 2; 
       }//end of else if 
      }//end of else if 
      else//Undercorrect 
      { 
       if(b1.getYPos() > y + 40) 
       { 
        y += yVel - 2; 
       }//end of if 
       else 
       { 
        y -= yVel - 2; 
       }//end of else 
      }//end of else 
     }//end of if 
     //Move around with ball but slightly slower 
     else 
     { 
      if(b1.getYPos() > y) 
      { 
       y += 3; 
      }//end of if 
      else 
      { 
       y -= 3; 
      }//end of else 
     }//end of else 
     //Prevents racket from leaving screen 
     if(y > 390) 
     { 
      y = 390; 
     }//end of if 
     else if(y < 0) 
     { 
      y = 0; 
     }//end of else if 
    }//end of move method 
    public int getY() 
    { 
     return y; 
    }//end of getY method 
    public int getX() 
    { 
     return x; 
    }//end of getX method 
    public int generateRandomNumber() 
    { 
     int randomNumber = 0; 
     randomNumber = generator.nextInt(5); 
     return randomNumber; 
    }//end of generateError 
    public void setYVel(int ballSpeed) 
    { 
     //yVel = ballSpeed - 0.9; 
     yVel = ballSpeed * 0.85; 
    }//end of setYVel method 
}//end of class 

Answer 1

あなたが何を意味するのか分かりません。あなたのコードをEclipseで試してみました.1人のプレイヤーと2人のプレイヤーでうまく動作します。唯一の問題は、ボールが画面の下に来ることです。この問題を解決するには、あなたが460

440へ

public void move() 
{ 
    x += xVel; 
    y += yVel; 
    if(y < 10) 
    { 
     yVel *= -1; 
    }//end of if 
    else if(y > 460)//here make this 440 from 460 
    { 
     yVel *= -1; 
    }//end of if 
}//end of move method 

Answer 2

からチェックピクセル座標位置を下を変更する必要がありますさて、それは私の窓のラップトップ上ではなく、私のMac上で働いていた理由は、理由はMacの第二のキーです。私はsを繰り返し押す代わりに、代わりにアクセントなどを含むsを含むメニューをポップアップするだろう。それは私のキーバインディングを乱していたので、ターミナルでそれを無効にして固定した。 これは私が入力したものだった：デフォルト書き込み-g ApplePressAndHoldEnabled -bool false