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Java Program to Calculate Area and Perimeter of a Rectangle



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This article covers a program in Java that find and prints area and perimeter of a rectangle based on its size provided by user at run-time of the program.

Note - The area of a rectangle is calculated using the formula len*bre. Where len and bre are the values of length and breadth, the two adjacent sides of rectangle, where length is greater than breadth.

Note - The perimeter of a rectangle is calculated using the formula (2*len) + (2*bre) or 2*(len+bre).

Find Area of Rectangle in Java

The question is, write a program in Java that calculates area of rectangle. The program given below is its answer:

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      float len, bre, area;
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the Length of Rectangle: ");
      len = s.nextFloat();
      System.out.print("Enter the Breadth of Rectangle: ");
      bre = s.nextFloat();
      
      area = len*bre;
      System.out.println("\nArea = " +area);
   }
}

The snapshot given below shows the sample run of above Java program with user input 6 as length and 4 as breadth of rectangle:

java find area of rectangle

Find Perimeter of Rectangle in Java

The question is, write a Java program to find and print perimeter of a rectangle. The answer to this question is the program given below:

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      float length, breadth, perimeter;
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the Length of Rectangle: ");
      length = s.nextFloat();
      System.out.print("Enter the Breadth of Rectangle: ");
      breadth = s.nextFloat();
      
      perimeter = (2*length) + (2*breadth);
      System.out.println("\nPerimeter = " +perimeter);
   }
}

The sample run of above program with same user input as of previous program's sample run, is shown in the snapshot given below:

java find perimeter of rectangle

Find Area and Perimeter of Rectangle in Java - Single Program

This is the last program of this article, created basically to print area and perimeter both, of a rectangle, whose length and breadth will get entered by user at run-time of the program:

import java.util.Scanner;

public class CodesCracker
{
   public static void main(String[] args)
   {
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the Length and Breadth of Rectangle: ");
      float a = s.nextFloat();
      float b = s.nextFloat();
      
      float ar = a*b;
      float pr = 2*(a+b);
      System.out.println("\nArea = " +ar);
      System.out.println("Perimeter = " +pr);
   }
}

Here is its sample run with user input 12 as length and 9 as breadth of rectangle:

java calculate area perimeter of rectangle

Note - For Area and Perimeter of Square Program in Java, refer to its separate article.

Same Program in Other Languages

Java Online Test


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