JButton可以使用，但是單擊時不會顯示我的圖標

Question

我有一個buttonlistener，它在單擊時會刪除TextFields和StartButton，但是告訴它運行應該顯示圖標的方法的代碼的最后一部分僅在末尾擰緊，但仍在刪除TextFields和JButton。 請幫忙。

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

您根本不必重寫paintComponent() 。 只需使用JLabel並設置布局即可。

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

附錄：這是收集啟動信息的另一種方法。

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");
        }
    }
}

Answer 2

您確定要覆蓋paintComponenet而不是paint嗎？ 考慮到您正在調用super.paint(g) ，我先來看那里。