Solutions for the problems of 22-Jan-2018

Note : Save this class inside Rectangle.java file

import java.util.Scanner;

public class Rectangle
{
// non static data members
int width;
int height;

// define a no argument constructor
public Rectangle()
{
System.out.println("object of rectangle created by no arg cnst");
}

// define a parameterized constructor
public Rectangle(int width, int height)
{
this.width = width;
this.height = height;
}

// define a non static method to show the data of rectangle
public void showRectangleInfo()
{
System.out.println("Rectangle info =>");
System.out.println("Width : "+width);
System.out.println("Height : "+height);

// get area of rectangle and store it
int area = width * height;
System.out.println("Area : "+area);

System.out.println(); // print a new line
}

// define main method
public static void main(String[] args)
{
/// create object of scanner to get data from keyboard
Scanner s = new Scanner(System.in);

System.out.print("Input width of rectangle :");
// get input from keyboard and store it inside local variables
int wi = s.nextInt();

System.out.print("Input width of rectangle :");
// get input from keyboard and store it inside local variables
int hi = s.nextInt();

// create object of rectangle by using parameterized constructor
// inside this constructor pass the values those were taken from the keyboard
Rectangle r = new Rectangle(wi, hi);

// show the information of rectangle using the method
r.showRectangleInfo();

}
}

===================================================

Note : Save this class inside Circle.java file

import java.util.Scanner;

public class Circle

{

// non static data member

double radius;

// define a no argument constructor

public Circle()

{

System.out.println("object of Circle created by no arg cnst");

}

// define a parameterized constructor

public Circle(double radius)

{

this.radius = radius;

}

// define a non static method to show the data of Circle

public void showCircleInfo()

{

System.out.println("## Circle info ##");

System.out.println("Radius : "+radius);

// get circumference of circle and store it

double cir = 2.0 * 3.14 * radius;

System.out.println("Circumference : "+cir);

// get diameter of circle and store it

double dia = 2.0 * radius;

System.out.println("Diameter : "+dia);

// get area of circle and store it

double area = 3.14 * radius * radius;

System.out.println("Area : "+area);

System.out.println();

}

// define main method

public static void main(String[] args)

{

/// create object of scanner to get data from keyboard

Scanner s = new Scanner(System.in);

System.out.print("Input radius of Circle :");

// get input from keyboard and store it inside local variables

double ra = s.nextDouble();

// create object of Circle by using parameterized constructor

// inside this constructor pass the value which is taken from the keyboard

Circle r = new Circle(ra);

// show the information of Circle using the method

r.showCircleInfo();

}

}

===================================================

Note : Save this class inside Square.java file

import java.util.Scanner;

public class Square

{

// non static data member

long side;

// define a no argument constructor

public Square()

{

System.out.println("object of Square created by no arg cnst");

}

// define a parameterized constructor

public Square(long side)

{

this.side = side;

}

// define a non static method to show the data of Square

public void showSquareInfo()

{

System.out.println("## Square info ##");

System.out.println("Side : "+side);

// get area of Square and store it

long area = side * side;

System.out.println("Area : "+area);

System.out.println();

}

// define main method

public static void main(String[] args)

{

/// create object of scanner to get data from keyboard

Scanner s = new Scanner(System.in);

System.out.print("Input side of Square :");

// get input from keyboard and store it inside local variables

long si = s.nextLong();

// create object of Square by using parameterized constructor

// inside this constructor pass the value which is taken from the keyboard

Square r = new Square(si);

// show the information of Square using the method

r.showSquareInfo();

}

}