A program that needs a code. How do i code this?

Question

Write a ColoredPoint class. It�s purpose will be to display a colored point within a window. One simple way to draw a point is to draw a line (which I would call a �pointline�) that begins and ends at the same point. The java.awt.Graphics class includes a member method drawLine(int,int,int,int).
Put your ColoredPoint class to use by writing a RandomPoints class that will draw points at random locations within a window. Allow a new random point to be drawn again and again indefinitely until the window is closed. A simple way to accomplish this is to generate and plot a random point within an infinite loop.
Notes
You may find the following classes to be helpful. When you import them, please import by full class name. Do not import an entire package by using the wild card symbol *. For example, use:
     The useful classes are:
     javax.swing.Jframe
     java.awt.Color
     java.awt.Graphics
     java.util.Random
How do i code this?

Answer 1

You should do your assignments on your own.
anyway here a code(U will have to modofy it a bit to make it worj the way u want, this code will give u a basic idea:
import java.awt.*;
import javax.swing.JFrame;
class MyFrame extends JFrame implements Runnable
int width = 500;
int height = 500;
int x,y;
int r, g, b ;
MyFrame ()
     setSize(width, height);
     setVisible(true);
     new Thread(this).start();
public void run()
    while(true)
        try
            if(isVisible())
             x= (int)(Math.random()*width);
             y= (int)(Math.random()*height);
             r = (int)(Math.random()*255); g = (int)(Math.random()*255); b = (int)(Math.random()*255);
             repaint();
            Thread.sleep(200);
        catch (InterruptedException e)
            e.printStackTrace();
public void update(Graphics graphics)
  graphics.setColor(new Color(r,g,b));
  graphics.drawLine( x,y,x,y);
public static void main(String[] args)
    new MyFrame();
}Tanveer