public class MySwingJDialog {
	public static void main(String[] args)
	{
		EventQueue.invokeLater(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				new MainFrame();
			}
			
		});
	}

}


class MainFrame
{
	private JFrame mainFrame;
	
	public MainFrame()
	{
		mainFrame = new JFrame();
		mainFrame.setTitle("Main Frame");
		
		
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		mainFrame.setSize(screenSize.width/2,screenSize.height/2);
		
		Dimension frameSize = mainFrame.getSize();
		if(frameSize.width > screenSize.width)
			frameSize.width = screenSize.width;
		if(frameSize.height > screenSize.height)
			frameSize.height = screenSize.height;
		mainFrame.setLocation((screenSize.width-frameSize.width)/2,(screenSize.height-frameSize.height)/2);
		
		mainFrame.add(btn,BorderLayout.CENTER);
		btn.addActionListener(new BtnAction());
		
		mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		mainFrame.setVisible(true);
		
		 
	}
	
	private class BtnAction implements ActionListener
	{

		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub
			new MyJDialog().dg.setVisible(true);
			
		}
		
		class MyJDialog
		{
			JDialog dg = new JDialog(mainFrame,true);
			 MyJDialog()
			 {
				 dg.setTitle("Dialog");
				 dg.setSize(150,150);
				 
				 JButton bt = new JButton("退出");
				 Container dg_c = dg.getContentPane();
				 bt.addActionListener(new BtAction());
				 dg_c.add(bt);
				 
			 }
			 
			 class BtAction implements ActionListener
			 {

				@Override
				public void actionPerformed(ActionEvent e) {
					// TODO Auto-generated method stub
					dg.dispose();
				}
				 
			 }
			
		}
			
	}
}