How to calculate Area and Perimeter of Parallelogram through a Java program ?.

Updated on September 17, 2014

Introduction

In this simple tutorial you will learn how to calculate Area and Perimeter of Parallelogram in Java. In Mathematics, you must have come across concept of Parallelogram in Mensuration chapter. Parallelogram is one of the most important shape in Mensuration. You must have studied in Mensuration about calculation of Area and Perimeter of Parallelogram. Parallelogram concepts are been asked in various top level competitive exams across the world. In order to calculate Area and Perimeter of Parallelogram following formulas have to be kept in mind.

Area of Parallelogram = h * a

Perimeter of Parallelogram = 2 * (a + b) , where a, b and h are as shown in fig.

In this Java tutorial, user is prompted on the Java console to enter value of a , b and h. Scanner class is used to read user inputs from the Java console. Scanner class takes help of input stream which listens to Java console. This Java utility uses these values and calculate Area and Perimeter of Parallelogram. It displays the result on Java console.

Java source code - How to calculate Area and Perimeter of Parallelogram.

```// Step 1 - Import all the required classes from Java API
// (Application Programming Interface). These classes have been
// written by Java developers which will help us in calculating
// Area and Perimeter of Parallelogram. In this tutorial we will use
// Scanner class present in java.util package.
import java.util.Scanner;

// Step 2 - In order to demonstrate how to code Area and Perimeter
// of Parallelogram, we will create a Java class. The class is named as
// Parallelogram in this tutorial.
public class Parallelogram {

// Step 3 - Parallelogram class has a method by the name main. It has a
// signature as public static void main(String [] args). It takes in a argument
// of array of String. Java Virtual Machine search in a class for this main method.
// This method is the starting point of execution. All of the Java code for calculating
// Area and Perimeter of Parallelogram is written inside this method.
public static void main(String[] args) {

// Step 4 - The logic behind coding this program is that, we want user should
// enter values for height and sides of Parallelogram. In order to get user inputs from
// console we have to create an object of class Scanner. Scanner class constructor takes
// in a input stream which listens to Java console. It takes parameter of System.in instance.
// System.in helps Scanner class to read user inputs from the Java console.
Scanner scanner = new Scanner(System.in);

// Step 5 - In order to calculate Area and Perimeter of Parallelogram, value of height
// and sides are required.
// Prompt the user to enter value of one of the sides of Parallelogram.
System.out.print("Enter value of one of the sides of Parallelogram : ");

// Step 6 - User enters one of the sides of parallelogram on Java the console.
// The value is been read by scanner object by the method nextDouble(). This value
// is been stored in the 'a' variable. Type of 'a' variable is double.
double a = scanner.nextDouble();

// Step 7 - Prompt the user to enter value of other side of Parallelogram.
System.out.print("Enter value of other side of Parallelogram : ");

// Step 8 - User enters other side of parallelogram on Java the console.
// The value is been read by scanner object by the method nextDouble(). This value
// is been stored in the 'b' variable. Type of 'b' variable is double.
double b = scanner.nextDouble();

// Step 9 - Prompt the user to enter value of height of Parallelogram.
System.out.print("Enter value of height of Parallelogram : ");

// Step 10 - User enters height of parallelogram on Java the console.
// The value is been read by scanner object by the method nextDouble(). This value
// is been stored in the 'h' variable. Type of 'h' variable is double.
double h = scanner.nextDouble();

// Step 11 - In order to store Area and Perimeter of Parallelogram in a variable, we will create a
// two variables by name area and perimeter. The area and perimeter variables will be of type
// double. Lets assign value 0 to both the variable.
double area = 0;
double perimeter = 0;

System.out.println("Calculating Area and Perimeter of Parallelogram - ");

// Step 12 - Formula for calculating Area of Parallelogram is as follows :
// Area of Parallelogram = a * h. The area is calculated and stored in the area variable.
area = a * h ;

// Step 13 - Formula for calculating Perimeter of Parallelogram is as follows :
// Perimeter of Parallelogram = 2 * (a + b). The perimeter is calculated and stored in
// the perimeter variable.
perimeter = 2 * (a + b) ;

// Step 14 - Displaying Area and Perimeter of Parallelogram on the Java console.

System.out.println("The Area of Parallelogram is - " + area);
System.out.println("The Perimeter of Parallelogram is - " + perimeter);
}

}
```

Steps to implement -

Step 1 - Import all the required classes from Java API (Application Programming Interface). These classes have been written by Java developers which will help us in calculating Area and Perimeter of Parallelogram. In this tutorial we will use Scanner class present in java.util package.

Step 2 - In order to demonstrate how to code Area and Perimeter of Parallelogram, we will create a Java class. The class is named as Parallelogram in this tutorial.

Step 3 - Parallelogram class has a method by the name main. It has a signature as public static void main(String [] args). It takes in a argument of array of String. Java Virtual Machine search in a class for this main method. This method is the starting point of execution. All of the Java code for calculating Area and Perimeter of Parallelogram is written inside this method.

Step 4 - The logic behind coding this program is that, we want user should enter values for height and sides of Parallelogram. In order to get user inputs from console we have to create an object of class Scanner. Scanner class constructor takes in a input stream which listens to Java console. It takes parameter of System.in instance. System.in helps Scanner class to read user inputs from the Java console.

Step 5 - In order to calculate Area and Perimeter of Parallelogram, value of height and sides are required. Prompt the user to enter value of one of the sides of Parallelogram.

Step 6 - User enters one of the sides of parallelogram on Java the console. The value is been read by scanner object by the method nextDouble(). This value is been stored in the 'a' variable. Type of 'a' variable is double.

Step 7 - Prompt the user to enter value of other side of Parallelogram.

Step 8 - User enters other side of parallelogram on Java the console. The value is been read by scanner object by the method nextDouble(). This value is been stored in the 'b' variable. Type of 'b' variable is double.

Step 9 - Prompt the user to enter value of height of Parallelogram.

Step 10 - User enters height of parallelogram on Java the console. The value is been read by scanner object by the method nextDouble(). This value is been stored in the 'h' variable. Type of 'h' variable is double.

Step 11 - In order to store Area and Perimeter of Parallelogram in a variable, we will create a two variables by name area and perimeter. The area and perimeter variables will be of type double. Lets assign value 0 to both the variable.

Step 12 - Formula for calculating Area of Parallelogram is as follows :

Area of Parallelogram = a * h. The area is calculated and stored in the area variable.

Step 13 - Formula for calculating Perimeter of Parallelogram is as follows :

Perimeter of Parallelogram = 2 * (a + b). The perimeter is calculated and stored in the perimeter variable.

Step 14 - Displaying Area and Perimeter of Parallelogram on the Java console.

Java code provided above is highly commented to make you understand each and every step in great detail. Follow these steps, understand and code it accordingly.

Important Steps -

```// Area of Parallelogram
area = a * h ;

// Perimeter of Parallelogram
perimeter = 2 * (a + b) ;```

Output of the program - Explanation

1. Run Parallelogram.java class. Java Virtual Machine searches for main method in Parallelogram class. It than starts executing main method step by step.

2. User is prompted to enter value of sides of Parallelogram such as a and b. Using Scanner class nextDouble method values of a and b are stored in variables a and b.

3. User is prompted to enter value of height of Parallelogram such as h. Using Scanner class nextDouble method value of h is stored in variable h.

4. Java code calculates Area and Perimeter of Parallelogram as :

Area of Parallelogram - a * h

Perimeter of Parallelogram - 2 * (a + b).

Lets take an example suppose user enters value of a, b and h as :

a = 10.

b = 20.

h = 20.

Area of Parallelogram would be - 10 * 20 = 200.

Perimeter of Parallelogram would be - 2 * ( 10 + 20 ) = 60.

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