java 简单的窗口程序之创建框架

import java.awt.*;

import javax.swing.*;

public class SwingG {
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable(){
			public void run(){
				SimpleFrame frame=new SimpleFrame();
				 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				frame.setVisible(true);
			}
		});
	}
}
class SimpleFrame extends JFrame{
	private static final int d=300;
	private static final int h=200;
	public SimpleFrame(){
		setSize(d,h);
	}
}