Rectangle.java

 public class Rectangle{
    
     	   private final double x, y;      // center of rectangle
	   private final double width;     // width of rectangle
	   private final double height;    // height of rectangle

	   // Constructor
	   public Rectangle(double x, double y, double width, double height){
	       if(width < 0.0 || height < 0.0) {
		   throw new IllegalArgumentException("diamentions of Rectangle must be positive!");
	       }
	       
	       this.x = x;
	       this.y = y;
	       this.width = width;
	       this.height = height;
	   }

	   public double area() {
	       return width * height;
	   }

	   public double perimeter() {
	       return 2 * width + 2 * height;
      	   }

	   public boolean intersects(Rectangle other) {
	       boolean result = true;
	       result &= Math.abs(this.x - other.x) < (this.width + other.width);
	       result &= Math.abs(this.y - other.y) < (this.height + other.height);
	       return result;
	   }

	   public boolean contains(Rectangle other) {
	       boolean result = true;
	       result &= Math.abs(this.x - other.x) < (this.width - other.width);
	       result &= Math.abs(this.y - other.y) < (this.height - other.height);
	       return result;
	   }

	   public void draw() {
	       StdDraw.rectangle(x, y, width / 2.0, height / 2.0);
	   }

}

TestClient.java

public class TestClient {

    public static void main(String[] args) {
	int n = Integer.valueOf(args[0]);
	double min = Double.valueOf(args[1]);
	double max = Double.valueOf(args[2]);

	Rectangle[] rects = new Rectangle[n];

	double totalArea = 0;
	double totalPerimeter = 0;
	
	for(int i = 0; i < n; ++i) {
	    double x = Math.random();
	    double y = Math.random();
	    double width = Math.random() * (max - min) + min;
	    double height = Math.random() * (max - min) + min;
	    
	    rects[i] = new Rectangle(x,y,width,height);
	    rects[i].draw();

	    totalArea += rects[i].area();
	    totalPerimeter += rects[i].perimeter();
	}

	totalArea /= n;
	totalPerimeter /= n;

	System.out.println("Average Area: " + totalArea);
	System.out.println("Average Perimeter: " + totalPerimeter);
    }
    
}