*In this tutorial, we will learn how to calculate the area and perimeter of a rectangle using the Java programming language with the BlueJ development environment. Let’s get started!*

## Table of Contents

## Understanding the Problem

Before we dive into the code, let’s understand what area and perimeter mean in the context of a rectangle.

**Area**: The area of a rectangle is the amount of space enclosed by its sides. It can be calculated by multiplying the length of the rectangle by its width.**Perimeter**: The perimeter of a rectangle is the total length of its sides. It can be calculated by adding the lengths of all four sides.

## Writing the Java Code

To find the area and perimeter of a rectangle in Java, we need to perform the following steps:

- Declare variables to store the length and width of the rectangle.
- Prompt the user to enter the values of the length and width.
- Calculate the area by multiplying the length and width.
- Calculate the perimeter by adding the lengths of all four sides.
- Display the calculated area and perimeter.

Here’s the Java code that accomplishes these steps:

```
import java.util.Scanner;
public class Rectangle {
public static void main(String[] args) {
// Step 1: Declare variables
double length, width, area, perimeter;
```

```
// Step 2: Prompt user for input
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the length of the rectangle: ");
length = scanner.nextDouble();
System.out.print("Enter the width of the rectangle: ");
width = scanner.nextDouble();
// Step 3: Calculate the area
area = length * width;
// Step 4: Calculate the perimeter
perimeter = 2 * (length + width);
// Step 5: Display the results
System.out.println("Area of the rectangle: " + area);
System.out.println("Perimeter of the rectangle: " + perimeter);
// Close the scanner
scanner.close();
}
}
```

## Running the Code

To run the code, follow these steps:

- Open BlueJ and create a new project.
- Create a new class called “Rectangle” and paste the code into the class.
- Compile and run the program.
- Enter the length and width of the rectangle when prompted.
- The program will display the calculated area and perimeter of the rectangle.

## Conclusion

In this tutorial post, we have explored how to find the area and perimeter of a rectangle in Java using the BlueJ programming language. By following the steps outlined in the code, you can easily calculate the area and perimeter of any rectangle. Remember to provide the length and width values as input to get the accurate results.

*Happy coding!*