就像别人说的一样，总是
JLabel用来显示图像。这样，很容易在需要时添加/删除它们，而不是绘画。此外，在您的代码中您正在重写
paint(...)，因为如果所讨论的组件具有一个，
Swing我们希望重写
paintComponent(...)各自的方法
JComponent。
在这里尝试这段代码，我已经分离了Controller部分，您可能对如何做事有所了解：
import java.awt.BorderLayout;import java.awt.Container;import java.awt.EventQueue;import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.Image;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.Icon;import javax.swing.JButton;import javax.swing.JLabel;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.SwingUtilities;import javax.swing.UIManager;import javax.swing.WindowConstants;public class New2 extends Jframe{ private static String SHOW_ACTION = "show"; private static String HIDE_ACTION = "hide"; public New2(String filename) { setTitle("MyWindow"); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setSize(800, 600); Container container = getContentPane(); container.setLayout(new BorderLayout()); container.add(createControls(), BorderLayout.CENTER); } private JPanel createControls() { JButton showButton = new JButton("Show"); showButton.setActionCommand(SHOW_ACTION); JButton hideButton = new JButton("Hide"); hideButton.setActionCommand(HIDE_ACTION); JLabel imageLabel = new JLabel(); New2Controller n2c = new New2Controller(showButton , hideButton, imageLabel); showButton.addActionListener(n2c); hideButton.addActionListener(n2c); JPanel panel = new JPanel(); panel.setLayout(new FlowLayout(FlowLayout.CENTER)); panel.add(imageLabel); panel.add(showButton); panel.add(hideButton); return panel; } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { New2 frame = new New2("/img/image.jpg"); frame.setVisible(true); } }); }}class New2Controller implements ActionListener{ private JButton showButton; private JButton hideButton; private JLabel imageLabel; private static String SHOW_ACTION = "show"; private static String HIDE_ACTION = "hide"; private Icon infoIcon = UIManager.getIcon("OptionPane.informationIcon"); public New2Controller(JButton show, JButton hide, JLabel label) { showButton = show; hideButton = hide; imageLabel = label; } public void actionPerformed(ActionEvent event) { String actionCommand = event.getActionCommand(); if (SHOW_ACTION.equals(actionCommand)) { SwingUtilities.invokeLater(new Runnable() { public void run() { imageLabel.setIcon(infoIcon); } }); } else if (HIDE_ACTION.equals(actionCommand)) { imageLabel.setIcon(null); } }}该代码代表您如何使用
ImageIO和阅读
URL，
import java.awt.BorderLayout;import java.awt.Container;import java.awt.EventQueue;import java.awt.FlowLayout;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.JLabel;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.SwingUtilities;import javax.swing.WindowConstants;import javax.imageio.ImageIO;public class New2 extends Jframe{ private static String SHOW_ACTION = "show"; private static String HIDE_ACTION = "hide"; public New2(String filename) { setTitle("MyWindow"); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setSize(800, 600); Container container = getContentPane(); container.setLayout(new BorderLayout()); container.add(createControls(), BorderLayout.CENTER); } private JPanel createControls() { JButton showButton = new JButton("Show"); showButton.setActionCommand(SHOW_ACTION); JButton hideButton = new JButton("Hide"); hideButton.setActionCommand(HIDE_ACTION); JLabel imageLabel = new JLabel(); New2Controller n2c = new New2Controller(showButton , hideButton, imageLabel); showButton.addActionListener(n2c); hideButton.addActionListener(n2c); JPanel panel = new JPanel(); panel.setLayout(new FlowLayout(FlowLayout.CENTER)); panel.add(imageLabel); panel.add(showButton); panel.add(hideButton); return panel; } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { New2 frame = new New2("/img/image.jpg"); frame.setVisible(true); } }); }}class New2Controller implements ActionListener{ private JButton showButton; private JButton hideButton; private JLabel imageLabel; private Image image; private ImageIcon imageIcon; private static String SHOW_ACTION = "show"; private static String HIDE_ACTION = "hide"; public New2Controller(JButton show, JButton hide, JLabel label) { showButton = show; hideButton = hide; imageLabel = label; try { image = ImageIO.read(getClass().getResource("/img/caIcon.png")); } catch(Exception e) { e.printStackTrace(); } imageIcon = new ImageIcon(image); } public void actionPerformed(ActionEvent event) { String actionCommand = event.getActionCommand(); if (SHOW_ACTION.equals(actionCommand)) { SwingUtilities.invokeLater(new Runnable() { public void run() { imageLabel.setIcon(imageIcon ); } }); } else if (HIDE_ACTION.equals(actionCommand)) { imageLabel.setIcon(null); } }}此外，当您使用
BorderLayout从未使用
NORTH，
EAST，
WEST和
SOUTH为BorderLayout的。他们已被替换
PAGE_START，
LINE_START，
LINE_END和
PAGE_END分别。
BorderLayout对象具有五个区域。这些区域由BorderLayout常量指定：
- PAGE_START
- PAGE_END
- LINESTART
- LINE_END
- 中央
版本说明：在JDK
1.4版之前，各个区域的首选名称有所不同，从指南针的点（例如，顶部区域为BorderLayout.NORTH）到我们示例中使用的常量的更高级版本。
我们的示例使用的常量是首选的，因为它们是标准的，并使程序能够适应具有不同方向的语言。
目录结构：
Your Project | | classes src | | img *.class(or package Folder)
现在使用
getClass().getResource("/img/star.png");
