Java awt-对话框简单实现

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class dia
{
	public static void main(String args[])
	{
		JButton btn1=new JButton("modal");
		JButton btn2=new JButton("unmodal");
		JFrame f=new JFrame("DIaloDemo");
		f.setSize(300,400);
		f.setLocation(300,200);
		f.setLayout(new FlowLayout());
		f.add(btn1);
		f.add(btn2);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setVisible(true);

		final JLabel label=new JLabel();
		final JDialog dialog=new JDialog(f,"Dialog");
		dialog.setSize(220,150);
		dialog.setLocation(350,250);
		dialog.setLayout(new FlowLayout());

		final JButton btn3=new JButton("sure");
		dialog.add(btn3);
		
		btn1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				dialog.setModal(true);
				if(dialog.getComponents().length==1){
					dialog.add(label);
				}
				label.setText("modal dialog,click to close");
				dialog.setVisible(true);
			}
		});

		
		btn2.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				dialog.setModal(false);
				if(dialog.getComponents().length==1){
					dialog.add(label);
				}
				label.setText("unmodal dialog,click to close");
				dialog.setVisible(true);
			}
		});

		
		btn3.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				dialog.dispose();
			}
		});

	}
}