Tutorial 9: Introduction to Constructor for Rectangle class

Tutorial 9: Introduction to Constructor for Rectangle class

 Code:

MainRectangle.java 

package tutorial;
import tutorial.Rectangle;
/**
 *
 * @author Ankit
 */
public class MainRectangle {
    public static void main(String[] args) {
        //nameofclass objectname = new nameofclass();
        //instantiating the class
        Rectangle rectFirstRectangle = new Rectangle(10,20);
        Rectangle rectSecondRectangle = new Rectangle(50);
        Rectangle rectThirdRectangle = new Rectangle();
       
        //initialization of the data members of the Rectangle class
        //objname.datamembername;
        //rectFirstRectangle.setiLength(10);
        //rectFirstRectangle.setiWidth(20);
       
        //calculate area
        //access the methods of the class
        //int iAreaOfRectFirst = rectFirstRectangle.calcArea();
       
        //print out
       
        //System.out.println("area of my first rectangle is:"+ iAreaOfRectFirst);
        System.out.print("Area of my first rectangle of dimention:"+rectFirstRectangle.getiLength()+"*"+rectFirstRectangle.getiWidth());
        System.out.println(" is:"+rectFirstRectangle.calcArea());
       
         System.out.print("Area of my second rectangle of dimention:"+rectSecondRectangle.getiLength()+"*"+rectSecondRectangle.getiWidth());
        System.out.println(" is:"+rectSecondRectangle.calcArea());
       
         System.out.print("Area of my third rectangle of dimention:"+rectThirdRectangle.getiLength()+"*"+rectThirdRectangle.getiWidth());
        System.out.println(" is:"+rectThirdRectangle.calcArea());
    }
}

Rectangle.java

package tutorial;


public class Rectangle {
    //data memebers
    //variables of the class
    private int iLength;
    private int iWidth;
   
    //member functions
    //functions of the class
   
    int calcArea(){
        return (iLength*iWidth);
    }

    //constructors
    //two argument constructor with (int, int)
    public Rectangle(int iLength, int iWidth) {
        this.iLength = iLength;
        this.iWidth = iWidth;
    }

    //one argument constructor (int)
    public Rectangle(int iLength) {
        this.iLength = this.iWidth = iLength ;
    }

   
    //no argument constructor
    public Rectangle() {
        this.iLength = 0;
        this.iWidth = 0;
    }

    //do nothing constructor
//    public Rectangle() {
//    }