Calculate Circle Area and Rectangle Area in Java Program

Calculate Circle Area

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class CalculateCircleAreaExample

{  

public static void main(String[] args)

{            

int radius = 0;

System.out.println("Please enter radius of a circle");               

try

{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

radius = Integer.parseInt(br.readLine());

}

catch(NumberFormatException ne)

{

System.out.println("Invalid radius value" + ne);

System.exit(0);

}

catch(IOException ioe)

{

System.out.println("IO Error :" + ioe);

System.exit(0);

}

double area = Math.PI * radius * radius;           

System.out.println("Area of a circle is " + area);

  }

}

Calculate Circle Perimeter

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class CalculateCirclePerimeterExample

{

 public static void main(String[] args)

{

      int radius = 0;

      System.out.println("Please enter radius of a circle");           

try

{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

radius = Integer.parseInt(br.readLine());

}

catch(NumberFormatException ne)

{

System.out.println("Invalid radius value" + ne);

System.exit(0);

}

catch(IOException ioe)

{

System.out.println("IO Error :" + ioe);

System.exit(0);

}

double perimeter = 2 * Math.PI * radius;

System.out.println("Perimeter of a circle is " + perimeter);

   }

}

Calculate Rectangle Area

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class CalculateRectArea

{

 public static void main(String[] args)

 {

          int width = 0;

int length = 0;                  

try

{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));            

System.out.println("Please enter length of a rectangle");

length = Integer.parseInt(br.readLine());

System.out.println("Please enter width of a rectangle");

width = Integer.parseInt(br.readLine());

}

catch(NumberFormatException ne)

{

System.out.println("Invalid value" + ne);

System.exit(0);

}

catch(IOException ioe)

{

System.out.println("IO Error :" + ioe);

System.exit(0);

}

int area = length * width;

System.out.println("Area of a rectangle is " + area);

   }

}