为什么我的JFrame不会响应鼠标和窗口的变化？
这是我的代码：
import java.awt.event.*; import java.awt.*; import javax.swing.*; public class wind extends JFrame implements ComponentListener, MouseListener { JButton button; JLabel label; public wind() { // initialise instance variables setTitle("My First Window!"); setSize(400, 200); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); JPanel content = new JPanel(); content.setLayout(new FlowLayout()); content.addComponentListener(this); content.addMouseListener(this); label = new JLabel("My First Window"); content.add(label); label.addComponentListener(this); button = new JButton("Click If You Wish To Live!"); button.addMouseListener(this); content.add(button) setContentPane(content); } public void componentHidden(ComponentEvent e){ try{wait(100);} catch(InterruptedException error){} button.setText("Hidden!"); } public void componentShown(ComponentEvent e){ try{wait(100);} catch(InterruptedException error){} button.setText("Shown!"); } public void componentResized(ComponentEvent e){ try{wait(100);} catch(InterruptedException error){} button.setText("Resized!"); } public void componentMoved(ComponentEvent e){ try{wait(100);} catch(InterruptedException error){} button.setText("Moved!"); } public void mouseExited(MouseEvent e){ try{wait(100);} catch(InterruptedException error){} label.setText("Exited!"); } public void mouseEntered(MouseEvent e){ try{wait(100);} catch(InterruptedException error){} label.setText("Entered!"); } public void mousePressed(MouseEvent e){ try{wait(100);} catch(InterruptedException error){} label.setText("pressed at: "+e.getX()+" "+e.getY()); } public void mouseReleased(MouseEvent e){ try{wait(100);} catch(InterruptedException error){} label.setText("Released!"); label.setLocation(e.getX(), e.getY()); } public void mouseClicked(MouseEvent e){} } 它不会响应鼠标或窗口重新resize，隐藏或移动。 此外，该按钮未显示。 固定！ 我刚刚开始学习Java的JFrame和其他图形，所以我不知道我的代码有什么问题，虽然我怀疑它与我制作按钮的方式有关，并且将监听器添加到对象中。 有人可以解释为什么会这样做，以及如何解决它。 先感谢您！
您的问题是您没有正确使用waitfunction。 尝试使用类javax.swing.Timer也称为Swing Timer for delays Swing程序中的Swing Timer for delays ， 简单动画和重复动作 。 有关更多信息，请参阅stackoverflow上的此示例： Java Wait Function
将ActionListener添加到JButton一种可能方法：
// You are adding an ActionListener to the button //Using the method addActionListener and a anonymous inner class button.addActionListener(new ActionListener() {//anonymous inner class @Override public void actionPerformed(ActionEvent arg0) { button.setText("Text modified by an event called ActionEvent!"); } });
我决定使用类似的代码，并想出了一些代码，试图在底部的状态栏中显示事物的状态：
import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Window; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ComponentAdapter; import java.awt.event.ComponentEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.AbstractAction; import javax.swing.AbstractButton; import javax.swing.Action; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.Timer; @SuppressWarnings({ "serial"}) // so the compiler won't complain public class MyWindPanel extends JPanel { private static final int PREF_W = 1200; private static final int PREF_H = 600; private static final String MOUSE_LOCATION = "Mouse Location [%04d, %04d]"; private static final String COMPONENT_STATE = "Component: %-15s"; private static final String TIMER_LABEL = "Elapsed Time: %02d:%02d:%02d:%03d"; private static final int TIMER_DELAY = 20; private static final String MOUSE_STATE = "Mouse State: %-15s"; public static final String BUTTON_TEXT = "Set MyWindPanel %s"; private JLabel mouseLocation = new JLabel( String.format(MOUSE_LOCATION, 0, 0)); private JLabel mouseState = new JLabel(String.format(MOUSE_STATE, "")); private JLabel componentState = new JLabel( String.format(COMPONENT_STATE, "")); private JLabel timerLabel = new JLabel( String.format(TIMER_LABEL, 0, 0, 0, 0)); private long startTime = System.currentTimeMillis(); private Action buttonAction = new MyButtonAction(String.format(BUTTON_TEXT, "Invisible")); private JPanel statusPanel; public MyWindPanel() { setBackground(Color.pink); Font font = new Font(Font.MONOSPACED, Font.BOLD, 14); mouseLocation.setFont(font); mouseState.setFont(font); componentState.setFont(font); timerLabel.setFont(font); statusPanel = new JPanel(); statusPanel.setLayout(new BoxLayout(statusPanel, BoxLayout.LINE_AXIS)); statusPanel.add(mouseLocation); statusPanel.add(Box.createHorizontalStrut(25)); statusPanel.add(mouseState); statusPanel.add(Box.createHorizontalStrut(25)); statusPanel.add(componentState); statusPanel.add(Box.createHorizontalStrut(25)); statusPanel.add(timerLabel); new Timer(TIMER_DELAY, new TimerListener()).start(); MouseAdapter myMouseAdapter = new MyMouseAdapter(); addMouseMotionListener(myMouseAdapter); addMouseListener(myMouseAdapter); addComponentListener(new MyComponentListener()); setLayout(new BorderLayout()); // add(statusPanel, BorderLayout.PAGE_END); } @Override public Dimension getPreferredSize() { return new Dimension(PREF_W, PREF_H); } public Action getButtonAction() { return buttonAction; } public JComponent getStatusPanel() { return statusPanel; } private class TimerListener implements ActionListener { private static final int SECONDS_PER_MIN = 60; private static final int MSEC_PER_SEC = 1000; private static final int MIN_PER_HOUR = 60; @Override public void actionPerformed(ActionEvent evt) { if (!MyWindPanel.this.isDisplayable()) { ((Timer) evt.getSource()).stop(); // so timer will stop when program // over } long currentTime = System.currentTimeMillis(); long diff = currentTime - startTime; int hours = (int) (diff / (MIN_PER_HOUR * SECONDS_PER_MIN * MSEC_PER_SEC)); int minutes = (int) (diff / (SECONDS_PER_MIN * MSEC_PER_SEC)) % MIN_PER_HOUR; int seconds = (int) ((diff / MSEC_PER_SEC) % SECONDS_PER_MIN); int mSec = (int) diff % MSEC_PER_SEC; timerLabel.setText(String.format(TIMER_LABEL, hours, minutes, seconds, mSec)); } } private class MyComponentListener extends ComponentAdapter { @Override public void componentHidden(ComponentEvent e) { componentState.setText(String.format(COMPONENT_STATE, "Hidden")); } @Override public void componentMoved(ComponentEvent e) { componentState.setText(String.format(COMPONENT_STATE, "Moved")); } @Override public void componentResized(ComponentEvent e) { componentState.setText(String.format(COMPONENT_STATE, "Resized")); } @Override public void componentShown(ComponentEvent e) { componentState.setText(String.format(COMPONENT_STATE, "Shown")); } } private class MyButtonAction extends AbstractAction { public MyButtonAction(String name) { super(name); } @Override public void actionPerformed(ActionEvent e) { boolean visible = MyWindPanel.this.isVisible(); String text = visible ? "Visible" : "Invisible"; ((AbstractButton) e.getSource()).setText(String.format(BUTTON_TEXT, text)); MyWindPanel.this.setVisible(!MyWindPanel.this.isVisible()); Window win = SwingUtilities.getWindowAncestor(MyWindPanel.this); win.revalidate(); win.repaint(); } } private class MyMouseAdapter extends MouseAdapter { @Override public void mouseMoved(MouseEvent e) { mouseLocation.setText(String.format(MOUSE_LOCATION, e.getX(), e.getY())); } @Override public void mouseDragged(MouseEvent e) { mouseState.setText(String.format(MOUSE_STATE, "Dragged")); mouseLocation.setText(String.format(MOUSE_LOCATION, e.getX(), e.getY())); } public void mousePressed(MouseEvent e) { mouseState.setText(String.format(MOUSE_STATE, "Pressed")); }; public void mouseReleased(MouseEvent e) { mouseState.setText(String.format(MOUSE_STATE, "Released")); }; public void mouseEntered(MouseEvent e) { mouseState.setText(String.format(MOUSE_STATE, "Entered")); }; public void mouseExited(MouseEvent e) { mouseState.setText(String.format(MOUSE_STATE, "Exited")); }; } private static void createAndShowGui() { MyWindPanel mainPanel = new MyWindPanel(); JPanel topPanel = new JPanel(); topPanel.add(new JButton(mainPanel.getButtonAction())); JFrame frame = new JFrame("MyWind"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.getContentPane().add(topPanel, BorderLayout.PAGE_START); frame.getContentPane().add(mainPanel.getStatusPanel(), BorderLayout.PAGE_END); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } }