Question

对于我正在制作的游戏，我希望玩家可以选择两个（或更多）按钮，当点击按钮时，会出现一个新屏幕。

但是，截至目前，第一个按钮的文本在单击时仍然保留。我在侦听器中尝试了setVisible（false），后来又尝试了setText（＆＃34;＆＃34;），但两者都只创建了错误。如果有人能给我任何其他建议，我会非常感激。我有以下整个游戏面板供参考，但只有B1Listener应该与问题相关。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import javax.swing.Timer;


public class Panel00 extends JPanel
{
  private BufferedImage myImage;
  private Graphics myBuffer;
  public Timer timer;
  public JButton button1;
  public JButton button2;
  public JLabel label1 = new JLabel("Good Choice!");
  public JLabel label2 = new JLabel("You're Fired!!");
  public int x = 10;        //CountDown from 100    
  public int delay = 1000;  //milliseconds
  boolean drawWorld = false;



  public Panel00()
  {

  myImage = new BufferedImage(1000, 1000, BufferedImage.TYPE_INT_RGB);
  myBuffer = myImage.getGraphics();




  setLayout(null);


  JButton button1 = new JButton();
  button1.setSize(300, 200);
  button1.setLocation(100,150);
  button1.setFont(new Font("Serif", Font.BOLD, 18));
  button1.setText("<html><center>"+"Until we are able to determine and understand this problem"+"<br>"+" and the dangerous threat it poses, our country cannot be the victims of horrendous attacks"+"<br>"+"by people that believe only in Jihad, and have no sense of reason or respect for human life"+"</center></html>");
  button1.addActionListener(new B1Listener());
  button1.setBorder(null);
  button1.setOpaque(false);
  button1.setContentAreaFilled(false);
  button1.setBorderPainted(false);
  add(button1);

  JButton button2 = new JButton();
  button2.setSize(300, 200);
  button2.setLocation(600,150);
  button2.setFont(new Font("Serif", Font.BOLD, 18));
  button2.setText("<html><center>"+"If ISIS wants to fight, fine with us. "+"<br>"+"We have wanted that fight for a long time. There is no room in the world for ISIS any more."+"<br>"+"The Muslims or us,  one of us will have to go."+"</center></html>");
  button2.addActionListener(new B2Listener());
  button2.setBorder(null);
  button2.setOpaque(false);
  button2.setContentAreaFilled(false);
  button2.setBorderPainted(false);
  add(button2);

  ActionListener counter = 
     new ActionListener() 
     {
        public void actionPerformed(ActionEvent evt) 
        { 
           repaint();
           x--;
           if (x == 0)
           {
              timer.stop();  
           }
        }
     };
  timer = new Timer(delay, counter);
  timer.start();


  setFocusable(true);  
  }


  public void paintComponent(Graphics g)
  {
     ImageIcon Nintendo = new ImageIcon("trumpT.jpg");

  g.drawImage(Nintendo.getImage(), 0, 0, 1000, 1000, null);

  ImageIcon N = new ImageIcon("trump speech.jpg");

  g.setColor(Color.WHITE);
  g.fillOval(90,100,320,320);

  g.setColor(Color.WHITE);
  g.fillOval(590,100,320,320);

  g.setColor(Color.WHITE);
  g.setFont(new Font("Serif",Font.BOLD, 50));
  g.drawString(""+x,500,50);

  if (drawWorld)
  {
     g.drawImage(N.getImage(), 0, 0, 1000, 1000, null); 
  }
 }

  private class B1Listener implements ActionListener
  {
     public void actionPerformed(ActionEvent e)
  {
     repaint();
     drawWorld = true;

     label1.setLocation(500,700);
     label1.setSize(400, 400);
     label1.setForeground(new Color(212, 175, 55));
     label1.setFont(new Font("Serif", Font.BOLD, 40));
     add(label1);

     button1.setText("");

     timer.stop();

  }
}

  private class B2Listener implements ActionListener
  {
     public void actionPerformed(ActionEvent e)
  {
     label2.setLocation(500,700);
     label2.setSize(400, 400);
     label2.setForeground(Color.RED);
     label2.setFont(new Font("Serif", Font.BOLD, 40));
     add(label2);
     timer.stop();
  }
 }
}

Answer 1

最好使用匿名内部类，比如

button1.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent ae) {
    button1.setText("");
  }
});

Answer 2

您的Panel00构造函数创建一个隐藏实例变量button1的本地button1，该按钮保持为null。你用button2做同样的事情。

在构造函数中

，更改

 JButton button1 = new JButton();
  ...
 JButton button2 = new JButton();

到

  button1 = new JButton();
  ...
  button2 = new JButton();

单击后删除JButton的文本

2 个答案: