Swing組件中,如何用壹個BUTTON彈出壹個新窗口?

例如 dialog.setVisble(true);

下面是壹個示例：

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

/**

*

* @author guan

*/

public class FrameDemo extends JFrame {

JButton loginButton =null;

JButton exitButton = null;

JPanel mainPanel =null;

JDialog dialog =null;

public FrameDemo() {

loginButton = new JButton("Login");

exitButton = new JButton("Exit");

loginButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

showDialog(); //顯示窗口

}

});

exitButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

System.exit(0); //關閉窗口

}

});

mainPanel = new JPanel();

mainPanel.add(loginButton);

mainPanel.add(exitButton);

this.add(mainPanel); //將主面板添加到frame中

}

/**

* 顯示對話框

*/

private void showDialog(){

this.setVisible(false);

dialog = new JDialog(this, true);

dialog.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE);

dialog.setSize(300,180);

dialog.setTitle("DialogTest");

dialog.add(new JLabel("這個是對話框"));

dialog.setLocationRelativeTo(this);

dialog.setVisible(true); //顯示對話框，窗口阻塞，不往下執行，只有等到對話框關閉了才往下執行。

//判斷主窗口是否是隱藏的，如果是隱藏的就顯示

if (!this.isVisible()) {

this.setVisible(true);

}

}

public static void main(String[] args) {

JFrame frame = new FrameDemo();

frame.setTitle("JFrame Demo");

frame.setSize(500, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

}