基本的Java Swing,如何退出和处理你的应用程序/ JFrame

发布时间：2020-12-14 05:33:27 所属栏目：Java 来源：网络整理

导读：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 maxWidt

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();
            }
        });
    }
}

（编辑：李大同）

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