/*
 * Created on Sep 5, 2003
 *
 */

public class Rectangle {
        // instance variables:
	private int x1, y1, x2, y2; // upper left and lower right corners
	private int width, height;

        // constructor:
	public Rectangle(int x, int y, int width, int height) {
		x1 = x;
		y1 = y;
		x2 = x+width;
		y2 = y+height;
		this.width = width;
		this.height = height;
	}
	
        // overriding the toString method defined in the class Object:
	public String toString() {
		return "a " + width + "x" + height + " rectangle at "
				+ "(" + x1 + "," + y1 + ")";
	}

	public int getX() { return x1; }
	public int getY() { return y1; }
	public int getWidth() { return width; }
	public int getHeight() { return height; }

	public int area() {
		return width * height;
	}
	
	public double diagonal() {
		return Math.sqrt(Math.pow(width,2)+Math.pow(height,2));
	}
	

	public boolean containsPoint(int x, int y) {
		return (x1 <= x) && (x <= x2) &&
			   (y1 <= y) && (y <= y2);
	}
	
	private boolean hasNegativeDimension() {
		return width < 0 || height < 0;
	}
	
	private Rectangle getIntersection(Rectangle r) {
		int left = Math.max(x1,r.x1);
		int right = Math.min(x2,r.x2);
		int top = Math.max(y1,r.y1);
		int bottom = Math.min(y2,r.y2);
		Rectangle result =
		       new Rectangle(left, top, right-left, bottom-top);
		if (result.hasNegativeDimension())
		       result = EMPTY;
		return result;
	}

}



public class TestProgram {
  public static void main(String args[]) {
    Stytem.out.println("Starting the test program...");
    Rectangle r = new Rectangle(10,25,50,100);
    System.out.println("r is " + r);  // implicitly calls toString
    Stytem.out.println("...done.");
  }
}


The output from this program would be:

Starting the test program...
r is a 50x100 rectangle at (10,25)
...done.