help with JFrame program

[Adewale Adebusoye]

Hi..i have posted this problem before but i didnt get an appropriate answer..maybe i didnt explain it well enough.

i have to implement a draw method that MUST have this signature:

draw(Point p1, Point p2, Point p3, int n, JFrame, w).

I came up with this code:

  import javax.swing.*;
import java.awt.*;
 
/*******************************************************************************
 * recursive triangles
 ******************************************************************************/
public class Triangle {
Point p1, p2, p3;
 
JFrame frame;
 
Triangle() {
// create new points
p1 = new Point(50, 50);
p2 = new Point(350, 50);
p3 = new Point(200, 350);
frame = new JFrame("Recursive Triangles");
frame.setBounds(100, 100, 400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
// draw on the frame
draw(p1, p2, p3, 3, frame);
}
 
void draw(Point p1, Point p2, Point p3, int n, JFrame f) {
if (p1 == null || p2 == null || p3 == null || f == null) {
System.exit(1);
}
 
if (n > 0) {
int x1 = p1.x;
int y1 = p1.y;
int x2 = p2.x;
int y2 = p2.y;
int x3 = p3.x;
int y3 = p3.y;
Graphics g = frame.getGraphics();
g.drawLine(x1, y1, x2, y2);
g.drawLine(x2, y2, x3, y3);
g.drawLine(x3, y3, x1, y1);
 
Point q = midPoint(p1, p2);
draw(p1, p3, q, n - 1, frame);
draw(p2, p3, q, n - 1, frame);

}
 
}
 
public Point midPoint(Point p1, Point p2) {
 
int x1 = p1.x;
int y1 = p1.y;
int x2 = p2.x;
int y2 = p2.y;
return new Point((x1 + x2) / 2, (y1 + y2) / 2);
}

public static void main(String args[]){
new Triangle();
}
 
}
  

Problem with this code is that it flickers when it draws the window. So can anyone help me get it working well..and at the same time adhere to the format of the draw method.
Personally..i could have done this another way but it has to be in this format. Thanks for helping..javaranch has never dissappointed!!!