OOP Lab

Overview

The purpose of this lab is to give you practice creating your own object. You will be given a class that expects an instance of the (yet undefined) Rectangle object.

Your job is to determine what attributes and methods the Rectangle class requires and create a class that will satisfy the requirements.

The RecDemo Class

You can begin with this RecDemo class:

// Use this class to test your own Rectangle class

public class RecDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// You can't substantially change this code.
		// Write your Rectangle class so the following
		// code will work correctly.
		
		Rectangle myRec;
		
		myRec = new Rectangle(5d, 3d);
		System.out.println(myRec.getValues());
		
		myRec = new Rectangle();
		System.out.println(myRec.getValues());
		
		myRec = new Rectangle(Rectangle.SMALL);
		System.out.println(myRec.getValues());
		
		myRec = new Rectangle(Rectangle.MEDIUM);
		System.out.println(myRec.getValues());
		
		myRec = new Rectangle(Rectangle.LARGE);
		System.out.println(myRec.getValues());

		System.out.println(Rectangle.calcPerimeter(5d, 6d));
		System.out.println(Rectangle.calcArea(5d, 6d));
		
	} // end main

} // end RecDemo
    

Please begin by copying this code into your editor, then creating a Rectangle class that can satisfy the requirements.

Expected Output

When the Rectangle class has been properly created, the output should look like the following:

width: 5.0, height: 3.0, area: 15.0, perimeter: 16.0
width: 5.0, height: 10.0, area: 50.0, perimeter: 30.0
width: 2.0, height: 3.0, area: 6.0, perimeter: 10.0
width: 5.0, height: 10.0, area: 50.0, perimeter: 30.0
width: 10.0, height: 15.0, area: 150.0, perimeter: 50.0
22.0
30.0
    

Tips

• Comment out most of the lines of RecDemo except the first couple.
• Write a part of the Rectangle code
• Test the code against the RecDeom
• Comment out a few more lines and repeat
• Your Class will probably have some constants and some static methods

Blackbelt Challenge

Add a Graphic Interface to the project. Use labels to print out all the output. Additionally, add text fields for height and width, and calculate the area and perimeter using your class.