Use the program (Listing 12.7 and 12.8, Page 463-464) and rewrite the program to do create RectangleWithException and TestRectangleWithException. Your exception should catch the input of any negative values for the sides of the rectangle.

12.7 listing

public class CircleWithException {

/** The radius of the circle */

private double radius;

/** The number of the objects created */

private static int numberOfObjects = 0;

/** Construct a circle with radius 1 */

public CircleWithException() {

this(1.0);

}

/** Construct a circle with a specified radius */

public CircleWithException(double newRadius) {

setRadius(newRadius);

numberOfObjects++;

}

/** Return radius */

public double getRadius() {

return radius;

}

/** Set a new radius */

public void setRadius(double newRadius)

throws IllegalArgumentException {

if (newRadius >= 0)

radius = newRadius;

else

throw new IllegalArgumentException(

"Radius cannot be negative");

}

/** Return numberOfObjects */

public static int getNumberOfObjects() {

return numberOfObjects;

}

/** Return the area of this circle */

public double findArea() {

return radius * radius * 3.14159;

}

}

12.8 listing

public class TestCircleWithException {

public static void main(String[] args) {

try {

CircleWithException c1 = new CircleWithException(5);

CircleWithException c2 = new CircleWithException(-5);

CircleWithException c3 = new CircleWithException(0);

}

catch (IllegalArgumentException ex) {

System.out.println(ex);

}

System.out.println("Number of objects created: " +

CircleWithException.getNumberOfObjects());

}

}