What code do I need to add?

I am writing a program to test if a point is inside of a circle. If the point is inside or on the border of the circle, it should be colored green. If not, it should be colored yellow. Here is my CircleComponent and Circle classes and the ellipses are where there is code needed for it to run properly.

****************Circle Class******************

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Ellipse2D;

/**
This class implements a circle and a boolean function to
test if a user-given point is inside this circle.
*/
public class Circle
{
/**
  Constructs a circle.
  @param x the x-coordinate of the center
  @param y the y-coordinate of the center
  @param r the radius
  @param aColor the color
*/
public Circle(double x, double y, double r, Color aColor)
{
  xCenter = x;
  yCenter = y;
  radius = r;
  color = aColor;
}

/**
  Draws a circle and a point.
  @param g2 the graphics content
*/
public void draw(Graphics2D g2)
{
  g2.setColor(color);
  Ellipse2D.Double circle
     = new Ellipse2D.Double(xCenter - radius, yCenter - radius,
        2 * radius, 2 * radius);
  g2.draw(circle);
}

/**
  Determine if point is inside or outside the circle
  @param p the point to test if it is inside the circle
  @return true if the point is inside the circle
*/
public boolean isInside(Point2D.Double p)
{
  . . .    <--- CODE needed
}

private double xCenter;
private double yCenter;
private double radius;
private Color color;
}

---

********************Circle Component************************

import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JOptionPane;

/**  
Draws a circle and a point. The point is colored green if it falls
inside the circle, red otherwise.  
*/  
public class CircleComponent extends JComponent  
{  
public CircleComponent(Point2D.Double point)  
{  
  circle = new Circle(200, 200, 100, Color.BLACK);  
  final double SMALL_RADIUS = 3;  
  Color color;  
  if(. . .)  
     . . .   
  else  
     . . .  
  smallCircle = new Circle(point.getX(), point.getY(), SMALL_RADIUS, color);  
}  

public void paintComponent(Graphics g)  
{  
  Graphics2D g2 = (Graphics2D) g;  
  circle.draw(g2);  
  smallCircle.draw(g2);  
}  

private Circle circle;  
private Circle smallCircle;  
}  

---