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points.java

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;

import javax.swing.JPanel;
import javax.swing.JFrame;

import java.util.Random;


public class Points extends JPanel {

public void paint(Graphics g) {
super.paint(g);

Graphics2D g2d = (Graphics2D) g;

g2d.setColor(Color.blue);

for (int i=0; i<=1000; i++) {
Dimension size = getSize();
Insets insets = getInsets();

int w = size.width - insets.left - insets.right;
int h = size.height - insets.top - insets.bottom;

Random r = new Random();
int x = Math.abs(r.nextInt()) % w;
int y = Math.abs(r.nextInt()) % h;
g2d.drawLine(x, y, x, y);
}
}

public static void main(String[] args) {

JFrame frame = new JFrame("Points");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new Points());
frame.setSize(250, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}