Dive deep into how OOP works in Java. Learn to write cleaner, more reusable code using OOP principles.

Java for Programmers

Object Oriented Programming (OOP) is a programming paradigm popular for large and complex systems. In this. module, dive deep into how OOP works in Java. Learn to write cleaner, more reusable code using OOP principles.

Object Oriented Programming

## Problem Statement

You are given a partially completed code of a `Rectangle` class in the editor. Add two fields i.e. `length` and `width` and modify the default and parametrized constructors which assign parameters to the `length` and `width` fields of the `Rectangle` class.
In the end, Implement the `getArea()` method which returns the area of the rectangle.


### Input
    Calls the constructor by passing length and width.
    Calls the `getArea()` method to return the area.

### Output
    Returns the area of a rectangle.

### Sample Input

```Java
        Rectangle obj = new Rectangle(2, 2);
```

### Sample Output
```Java
        4
```



# Problem Statement

You are given a partially completed code of a `Rectangle` class in the editor. Add two fields i.e. `length` and `width` and modify the default and parametrized constructors which assign parameters to the `length` and `width` fields of the `Rectangle` class.
In the end, Implement the `getArea()` method which returns the area of the rectangle.


## Input
    Calls the constructor by passing length and width.
    Calls the `getArea()` method to return the area.

## Output
    Returns the area of a rectangle.

## Sample Input

```Java
        Rectangle obj = new Rectangle(2, 2);
```

## Sample Output
```Java
        4
```



Can you implement the rectangle class using the concepts of encapsulation? A solution is placed in the "solution" section to help you, but we would suggest you try to solve it on your own first.

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Aggregation and Composition

Challenge 1: Implement the Rectangle Class Using the Concepts of Encapsulation

Problem Statement