Purchase Solution

Using constructor to create Rectangle class

Not what you're looking for?

Ask Custom Question

The Class for a Rectangle is shown below. PlaneRectangle is a specialisation of Rectangle with fields that define the location of the centre of the rectangle. Write Java Classes that are implementations of the Rectangle Class and of the PlaneRectangle Class.
Now add methods to the Java PlaneRectangle Class that:
a. enable the location of an instance of PlaneRectangle to be moved by a specified distance (expressed as a change in the x-coordinate, and a change in the y-coordinate).
b. Enable a check to be made that a given point lies inside or outside the rectangle.
c. Enable a check to be made that another instance of PlaneRectangle lies completely within the current instance.

These classes come with default "constructor methods". Write the Java code for new constructors for the Rectangle Class that enable:
a. An instance of the Rectangle Class to be created with a default length of 1.0. and a default width of 1.0.
b. An instance of the Rectangle Class can be created with user specified values for the length and width.
Now add constructors to the PlaneRectangle Class to enable:
a. An instance of the PlaneRectangle Class to be created with the above default length and width, and located at the origin by default.
b. An instance of the PlaneRectangle Class to be created with user specified values for the length, width and location.

Write a Java application that enables the user to specify the length, width and location of two instances of a PlaneRectangle and check whether the first lies completely within the second.

Attachments
Purchase this Solution
Solution Summary

In this solution you will learn about Java constructors, and how to use them to create an small application. In particular this example shows the use of a constructor in creating a shape object called Rectangle. Note, you can use the same concept for other geometric shapes.

Solution Preview

"These classes come with default "constructor methods"."

Every class has at least one constructor. If you do not write a constructor, the Java programming language provides one for you. This constructor takes no arguments and has an empty body.
The default constructor doesn't do anything. So, if you want to perform some initialization, you will have to write some constructors for your class.

"Write the Java code for new constructors for the Rectangle Class that enable:
a. An instance of the Rectangle Class to be created with a default length of 1.0. and a default width of 1.0."

Constructors are identified by the two following rules:

The method name must exactly match the classname.
There must not ...

Purchase this Solution
Free BrainMass Quizzes
Excel Introductory Quiz

This quiz tests your knowledge of basics of MS-Excel.

Word 2010: Tables

Have you never worked with Tables in Word 2010? Maybe it has been a while since you have used a Table in Word and you need to brush up on your skills. Several keywords and popular options are discussed as you go through this quiz.

Word 2010: Table of Contents

Ever wondered where a Table of Contents in a Word document comes from? Maybe you need a refresher on the topic? This quiz will remind you of the keywords and options used when working with a T.O.C. in Word 2010.

Javscript Basics

Quiz on basics of javascript programming language.

Basic Networking Questions

This quiz consists of some basic networking questions.

View More Free Quizzes
Related BrainMass Solutions

  • Rectangle class using Java

    481923 Rectangle class using Java Create a Rectangle class with - Private attributes for width and height - A default constructor that sets the height to 10 and width to 25.

  • How to write Java code for a Rectangle


    For that, you need to check if the four vertices of the rectangle PR1 is within PR2.
    You can do that by using b) of Question 1..."b. Enable a check to be made that a given point lies inside or outside the rectangle."

  • A sample VB class demonstrating methods and properties

    Public Class Rectangle Private len As Integer Private width As Integer 'Constructor to initialize rectangle with length and width parameters Public Sub Rectangle(ByVal length As Integer, ByVal width As Integer) Me.len =

  • C++ class

    Also, if you could help to explain to me how both constructors can be replaced with one constructor by using a single constructor with default parameters. see attached file define a person class using c++

  • Constructing Shapes Through Inheritance and Aggregation

    In the Shape class, eliminate the concrete methods, area() and perimeter(); create an instance variable of type String called name; and make a constructor that requires a String, shapeName, as the name of the new Shape object.

  • Structures and Classes

    Write code creating an instance (using the class constructor).

  • Java Programming

    method { no_doors = i; } public int GetDoors() { return no_doors; } } Now use this class and write a small program where in Main you create 2 objects of type car using the constructor method (one

  • Class named RealtorCommission

    101955 C++ Programming Create a class named RealtorCommission. Fields include the sale price of a house, the sales commission rate, and the commission. Create two constructors.

  • Writing JAVA Programming Scripts

    How does a programmer typically get access to a Graphics object when coding an applet? One must be created with the Graphics constructor. It is an instance variable of the class JApplet. It is a parameter of the paint method. 6.

View More Related Solutions