Chapter 1, Problem 1E

Explanation of Solution

Given: The class names such as Circle, Square, Triangle, Person, and Canvas.

To find: The possible way to create another circle and then a square.

Solution:

Start BlueJ and open a new project named figures.

A new window will appear on the screen in which each rectangular block will represent a class.

In order to create an object of Circle class, it is necessary for the user to right click on the Circle class and then click on the new Circle() from the pop-up menu. The user can provide a specific name of the instance and then click ok button.

A new red rectangle will appear at the bottom of the BlueJ screen labeled with the name of the instance provided by the user.

In order to create an object of Square class, it is necessary for the user to right click on the Square class and then click on the new Square() from the pop-up menu. The user will be prompt to provide a specific name of the instance and then click ok button.

Another red rectangle will appear at the bottom of the BlueJ screen labeled with the name of the instance provided by the user.