Labs

In this lab we will use exceptions to validate user input.

Starter code in Exceptions/com.example.exceptions.labs.shapes.

Solutions in Exceptions/com.example.exceptions.solutions.shapes

  1. Modify the setter for the Circle class's radius. Unless the provided radius is greater than zero, throw an IllegalArgumentException with an appropriate message. Do the same for the width and height setters in Rectangle. What happens when you run ShapeTester?

(Solution: Circle.java, Rectangle.java, ShapeTester.java)

  1. Modify ShapeTester, adding a try/catch so that if an exception occurs while adding shapes, its message will be printed to STDERR, but any previously-added shapes will still be printed.

(Solution: ShapeTester2.java)

  1. Modify ShapeTester again, so that if an exception occurs while adding a shape, shapes will continue to be added and all that were added will be printed.

(Solution: ShapeTester3.java)

  1. In Circle, change the setter for radius so that instead of IllegalArgumentException it throws Exception. Make whatever additional changes are necessary so that you can run ShapeTester, with ShapeTester receiving any thrown exception. Make the same changes to Rectangle.

(Solution: Circle2.java, Rectangle2.java, ShapeTester4.java)

Prev -- Up