java - JButton 可以工作，但在单击时不会显示我的图标

Question

我有一个按钮监听器，它在单击时删除 TextFields 和 StartButton，但是代码的最后一部分告诉它运行一个应该显示图标的方法只是在最后搞砸了，但是仍然删除 TextFields 和 JButton。请帮忙。

public class TypeInNames extends JApplet{

  JButton StartButton;
  JTextField name1, name2;
  String player1, player2;
  String reply;
  boolean test = false;
  ImageIcon myIcon;

  Container cp = getContentPane();

     public void init() 
     {
         setSize(350, 400);
         setLayout(null);

         cp.setBackground(Color.black);

         StartButton = new JButton("Start Game!");
         name1 = new JTextField("Player 1",35);
         name2 = new JTextField("Player 2",35);
         //(x, y, width, height);
         StartButton.setBounds(115,200,120,30);
         name1.setBounds(115,140,120,20);
         name2.setBounds(115,170,120,20);

         startGame();
     }

     public void startGame()
     {
         add(StartButton);
         add(name1);
         add(name2);

         StartButton.addActionListener(new ButtonListener());
     }

     public void game()
     {

     }

     public void endGame()
     {
         myIcon = new ImageIcon("portal-cake.jpg");
         test = true;
         repaint();
     }

     public void paintComponent(Graphics g) {
         super.paint(g);
         if(test)
             myIcon.paintIcon(this, g, 0, 0);
     }

     private class ButtonListener implements ActionListener{

         public void actionPerformed(ActionEvent event)
         {
             if (event.getSource() == StartButton)
             {
                 player1 = name1.getText();
                 player2 = name2.getText();
                 remove(StartButton);
                 remove(name1);
                 remove(name2);

                 endGame();
             }
         }

     }



 }

Answer 1

您根本不必重写 paintComponent()。只需使用 JLabel 并设置布局即可。

public void endGame() {
    myIcon = new ImageIcon("portal-cake.jpg");
    JLabel label = new JLabel(myIcon);
    this.setLayout(new GridLayout());
    this.add(label);
    this.validate();
}

附录:这是收集启动信息的另一种方法。

import java.awt.*;
import javax.swing.*;

public class TypeInNames extends JApplet {

    JTextField name1 = new JTextField("Player 1", 35);
    JTextField name2 = new JTextField("Player 2", 35);

    @Override
    public void init() {
        this.getContentPane().setBackground(Color.black);
        Icon myIcon = new ImageIcon("portal-cake.jpg");
        JLabel label = new JLabel(myIcon);
        this.add(label);
        startGame();
    }

    private void startGame() {
        JPanel panel = new JPanel(new GridLayout(0, 1));
        panel.add(new JLabel("Player 1:"));
        panel.add(name1);
        panel.add(new JLabel("Player 2:"));
        panel.add(name2);
        int result = JOptionPane.showConfirmDialog(
            this, panel, "Click OK to Start",
            JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
        if (result == JOptionPane.OK_OPTION) {
            System.out.println("Selected:"
                + " " + name1.getText()
                + " " + name2.getText());
        } else {
            System.out.println("Cancelled");
        }
    }
}