Explore the fundamentals of OOP in Java. Gain insights into inheritance, polymorphism, and more to write clean, modular, reusable code through interactive exercises and practical challenges.

cpp17.tar.gz

Object-oriented programming (OOP) has been around for decades. As the original object-oriented language, Java is a mainstay in the world of computer programming. 

Having a foundation in OOP Java concepts will allow you to write cleaner, more modular, and more reusable code, as well as make it easier for you to understand the codebases of different companies you might be interested in joining.

Starting with the basics and reviewing complex topics like inheritance and polymorphism, this course is filled with illustrations, exercises, quizzes, and hands-on challenges. You’ll walk away with an understanding of classes and objects behavior and be able to easily create simple, efficient, reusable and secure code.

Learn Object-Oriented Programming in Java

Which keyword is used to derive a class from another class?

Which keyword is used to derive a class from another class?

A subclass can use all the fields and methods of the superclass directly which are: 

A subclass can use all the fields and methods of the superclass directly which are:

Subclass is not calling the parent class constructor

Superclass is not calling the subclass constructor

```java
class A {
    
    int i;
    public A(int i)
    {
        this.i=i; 
    }
    
}
class B extends A{
    
    int j;
    public B(int j)
    {
        this.j=j;
    }
    
}
```
The above code won't compile because

<pre><code class="language-java">class A {
 
 int i;
 public A(int i)
 {
 this.i=i; 
 }
 
}
class B extends A{
 
 int j;
 public B(int j)
 {
 this.j=j;
 }
 
}
</code></pre>
The above code won’t compile because

The <code>super</code> keyword is used to call?

Calls to constructors using `this( )` and `super( )` can be written inside

Calls to constructors using <code>this( )</code> and <code>super( )</code> can be written inside

Let's test your understanding of Inheritance with the help of this short quiz.

Introduction to Object-Oriented Programming

Classes and Objects

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Data Hiding

Composition, Aggregation and Association

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Object Oriented Programming in Java - Exam I

Inheritance

Polymorphism

Abstract Classes and Interfaces

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Object Oriented Programming in Java - Exam II

Quiz