//定義particle類public class Particle{	float velocityX, velocityY, x, y;        public Particle()	{	}	//initialize方法，負(fù)責(zé)初始化	public void initialize(int mx, int my)	{		velocityX = (float)((Math.random()*0.5)-0.25f);		velocityY = (float)((Math.random()*0.5)-0.25f);		x = (float)(mx+velocityX);		y = (float)(my+velocityY);	}	//update方法	public void update(float[] v1, float[] v2, float[] v3, float[] v4, float[] v5, int i, boolean chaseMouse)	{		velocityX+=(v1[0]+v2[0]+v3[0]+v4[0]+v5[0]);		velocityY+=(v1[1]+v2[1]+v3[1]+v4[1]+v5[1]);			x+=velocityX;		y+=velocityY;      		if(i==0 && !chaseMouse)		{			x+=velocityX*1.6f;	                y+=velocityY*1.6f;		}			if(Math.abs(velocityX) > 5.0f)			velocityX = (velocityX/Math.abs(velocityX))*5.0f;		if(Math.abs(velocityY) > 5.0f)			velocityY = (velocityY/Math.abs(velocityY))*5.0f;	}			}