使用这样的代码处理JFrame的好方法是什么？我想处理窗口退出和窗口关闭.
我知道我们不应该使用System.exit();
public class JavaCellularautomataSquare {
public static final String TITLE = "Cellular Automata - Squaring Example";
private int maxWidth = 600;
private int maxHeight = 600;
public void launch() {
final JFrame frame = new JFrame(TITLE);
frame.setLocation(20,20);
frame.setPreferredSize(new Dimension(maxWidth,maxHeight));
frame.setResizable(false);
frame.setFocusable(true);
final JPanel panel = new JPanel();
panel.setLocation(20,20);
panel.setVisible(true);
panel.setPreferredSize(new Dimension(maxWidth,maxHeight));
panel.setFocusable(true);
panel.setBackground(Color.white);
// Panel setup,toggle visibility on frame
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
}
解决方法
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ClosingFrame extends JFrame {
private JMenuBar MenuBar = new JMenuBar();
private JFrame frame = new JFrame();
private static final long serialVersionUID = 1L;
private JMenu File = new JMenu("File");
private JMenuItem Exit = new JMenuItem("Exit");
public ClosingFrame() {
File.add(Exit);
MenuBar.add(File);
Exit.addActionListener(new ExitListener());
WindowListener exitListener = new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,"Are You Sure to Close this Application?","Exit Confirmation",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE,null,null);
if (confirm == JOptionPane.YES_OPTION) {
System.exit(0);
}
}
};
frame.addWindowListener(exitListener);
frame.setDefaultCloSEOperation(EXIT_ON_CLOSE);
frame.setJMenuBar(MenuBar);
frame.setPreferredSize(new Dimension(400,300));
frame.setLocation(100,100);
frame.pack();
frame.setVisible(true);
}
private class ExitListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,null);
if (confirm == JOptionPane.YES_OPTION) {
System.exit(0);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokelater(new Runnable() {
@Override
public void run() {
ClosingFrame cf = new ClosingFrame();
}
});
}
}