rect.java

可随机画出位置形状均不相同的直线

import java.awt.Graphics;
import javax.swing.JComponent;
public class rect extends JComponent
{
    public rect() 
    {
    	super();
    }
    public void paint(Graphics g)
    {
    	g.setColor(getBackground());
    	g.drawRect(0,0,getWidth()-1,getHeight()-1);
    }  
}