import javax.swing.*;
import java awt.*;
imprt java.awt.event.*;
public class Ex extends JFrame
{
int x,y;
public Ex()
{
this.setTitle("线程演示");
Container c=this.getContentPane();
JLabel L=new JLabel("单击可以画线哟",JLabel.CENTER);
c.add(L,BorderLayout.CENTER);
jbUTTON B=NEW jbUTOON("试试按我");
b.setBorder(BorderFactory.createLineBorder (Color.red,5);
c.add(b,borderLayout.SOUTH);
L.addMouseListener(new MouseAdapter(){
x=e.getX();
y=e.getY();
repaint();
}
});
this.setSize(300,400);
this.show();
}
public void update(Graphics g)
{
g.drawLine(0,0,x,y);
}
public static void main(String[] args)
{
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