我创建了一个JPanel并添加了几个简单的按钮,并附加了监听器.然后我决定将一个Image添加到我的面板的背景中,所以我将我的JPanel切换到了ImagePanel.按钮正在JPanel上工作,但现在我为要显示的背景图像添加了一堆代码,按钮不再显示.我没有更改任何按钮添加代码,所以我很困惑为什么按钮不再显示.这也发生在我单独的GameFrame类中.我在面板中添加了2个矩形组件,然后是3个按钮.对于该面板,只有按钮显示,尽管在添加按钮之前矩形工作.我可以每个面板只有一种类型的JComponent吗？我真的不明白为什么这样做.感谢您的时间.

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class TitleFrame extends JFrame

{

private ImagePanel panel;

private JButton mage;

private JButton rogue;

private JButton warrior;

private Image image;

public TitleFrame()

{

JFrame frame = new JFrame();

frame.setSize(1024, 768);

frame.setTitle("Title Screen");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

createMageButton();

createRogueButton();

createWarriorButton();

ImagePanel panel = new ImagePanel(new ImageIcon("C:/Users/Derek Reitz/Documents/Eclipse Projects/GameApp/src/background.jpg").getImage());

panel.add(mage);

panel.add(rogue);

panel.add(warrior);

panel.paintComponent(frame.getGraphics());

frame.getContentPane().add(panel);

}

private void createRogueButton() {

rogue = new JButton("Select Rogue");

class AddButtonListener implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

moveToNextFrame('r');

}

}

ActionListener listener = new AddButtonListener();

rogue.addActionListener(listener);

}

private void createWarriorButton() {

warrior = new JButton("Select Warrior");

class AddButtonListener implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

moveToNextFrame('w');

}

}

ActionListener listener = new AddButtonListener();

warrior.addActionListener(listener);

}

private void createMageButton() {

mage = new JButton("Select Mage");

class AddButtonListener implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

moveToNextFrame('m');

}

}

ActionListener listener = new AddButtonListener();

mage.addActionListener(listener);

}

public void moveToNextFrame(char c)

{

GameFrame game = new GameFrame(c);

}

class ImagePanel extends JPanel

{

private Image img;

public ImagePanel(Image img) {

this.img = img;

Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));

setPreferredSize(size);

setMinimumSize(size);

setMaximumSize(size);

setSize(size);

setLayout(null);

}

public void paintComponent(Graphics g) {

g.drawImage(img, 0, 0, null);

}

}

}