import?java.awt.*;
import?java.awt.event.WindowAdapter;
import?java.awt.event.WindowEvent;


public?class?drawline?{

	/**
	?*?@param?args
	?*/
	public?static?void?main（String[]?args）?{
		//?TODO?Auto-generated?method?stub
		new?Paintframe（）.launchframe（）;
	}

}


@SuppressWarnings（“serial“）
class?Paintframe?extends?frame{
	
	public?void?launchframe（）{
		setBounds（200200600400）;
		this.addWindowListener（new?MywindowMonitor（））;//窗口關(guān)閉功能
		setVisible（true）;
	}
	public?void?paint（Graphics?g）??{
		int?x=this.getWidth（）/2;
		int?y=this.getHeight（）/2