drawpanel.java

分子无规则运动演示

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.ArrayList;

public class DrawPanel extends JPanel
{
	private ArrayList balls=new ArrayList();
	public DrawPanel()
	{
		this.addMouseListener(
			new MouseAdapter()
			{
				public void mouseClicked(MouseEvent e)
				{
					int x=e.getX();
					int y=e.getY();
					Ball ball=new Ball(x,y,DrawPanel.this);
					balls.add(ball);
					Thread t=new BallThread(ball);
					t.start();
				}
			}
		);		
	}
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		for(int i=0;i<balls.size();i++)
			((Ball)balls.get(i)).drawBall(g);
	}
}