java Frame border

I am working on a lab and i have to create animation, and right now i am just creating the shapes I need and make sure they are in random locations and within the frame of 1000*700.

This lab also uses inheritance and so there are a few classes, but the class which creates the random one i have here :

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.Color;
import java.awt.geom.Ellipse2D;
import javax.swing.JComponent;
import java.util.ArrayList;

public class ShapeComponent extends JComponent
{  
private int instances = 40;
final static double MaxX = 1000;
final static double MaxY = 700;
final static double MinR = 10;
final static double MaxR = 30;

    ArrayList<Shape3> shape3 = new ArrayList<Shape3>(); 

 public ShapeComponent(){

     int i;
     int value = 2;

     for(i=0;i<instances;i++){

    double radius  = (double) (Math.random() * (MaxR - MinR) + MinR);
         System.out.println(radius);
         double x = (double)(Math.random() * (MaxX - 4*radius) + 2*radius);
         System.out.println(x);

         double y = (double)(Math.random() * (MaxY - 4*radius) + 2*radius);
          System.out.println(y);
         System.out.println();
         shape3.add(new Shape3(x,y,radius));

     }
         }

   public void paintComponent(Graphics g)
   {  
      Graphics2D g2 = (Graphics2D) g;

   int i ;
       for(i=0;i<instances;i++){
    Shape3 shape = shape3.get(i);
           shape.draw(g2);
       }

    }
}

So I used the print line to see the x, y coordinates and they all look within the range. since the width is 1000 , the math.random creates it between 60-940 and the height between 60-640. I have no idea why it is coming off as wrong, but it appears like a few of the objects are off the frame by the slightest of margins. Can anyone help?

Thank you Kindly