如何用Java代码真正关闭JDialog？

如何用Java代码真正关闭JDialog？

发送

JDialog

一个

WindowEvent.WINDOW_CLOSING

使用事件

dispatchEvent()

，

附录：

System.exit()

应谨慎使用，在下面的示例中，第二个非守护线程正常完成，即使对话框在退出循环之前已关闭。有关详细信息，请参见JLS§12.8程序退出
。

import java.awt.EventQueue;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.AbstractAction;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JLabel;public class DialogEventTest extends JDialog {    public DialogEventTest() {        this.setLayout(new GridLayout(0, 1));        this.add(new JLabel("Dialog event test.", JLabel.CENTER));        this.add(new JButton(new AbstractAction("Close") { @Override public void actionPerformed(ActionEvent e) {     DialogEventTest.this.setVisible(false);     DialogEventTest.this.dispatchEvent(new WindowEvent(         DialogEventTest.this, WindowEvent.WINDOW_CLOSING)); }        }));        this.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) {     System.out.println(e.paramString()); }        });    }    private void display() {        this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);        this.pack();        this.setLocationRelativeTo(null);        this.setVisible(true);    }    public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() { @Override public void run() {     new DialogEventTest().display(); }        });        new Thread(new Runnable() { @Override public void run() {     System.out.println("Starting…");     for (int i = 0; i < 5; i++) {         try {  Thread.sleep(1000);  System.out.println((i + 1) + "s. elapsed.");         } catch (InterruptedException e) {  e.printStackTrace(System.err);         }     }     System.out.println("Finished."); }        }).start();    }}