不错，静听松声寒!!

import java.applet.Applet;
import java.awt.Graphics;
public class Test2 extends Applet {
public void init() {
}
public void paint(Graphics g) {
g.drawString("静听松声寒!!", 35, 50 );
tree(200.0,400.0,200.0,0.0,8,g);
}
public void tree(double x1,double y1,double x2,double y2,int n,Graphics g)
{
if(n>=1){
double x3,x4,y3,y4;
// g.drawString("I believe !",0,300);
g.drawLine((int)(x1),(int)(y1),(int)(x2),(int)(y2));
x3=(x1+x2)/2;
y3=(y1+y2)/2;
tree(x1,y1,x3,y3,n-1,g);
tree(x3,y3,x2,y2,n-1,g);
x4=(x2+y2-y3-x3)*0.7071+x3;
y4=(y2-x2+x3-y3)*0.7071+y3;
tree(x3,y3,x4,y4,n-1,g);
x3=(x1*3+x2)/4;
y3=(y1*3+y2)/4;
x2=(x2*3+x1)/4;
y2=(y2*3+y1)/4;
x4=(x2*1.732-y2+2*x3-x3*1.732+y3)/2;
y4=(x2+y2*1.732-x3+2*y3-1.732*y3)/2;
tree(x3,y3,x4,y4,n-1,g);
}
}
}