What is the difference between an abstract class and an interface in Java?

Both abstract classes and interfaces are used to define abstract methods in Java, which are methods without a body. However, there are some differences between the two:

1. Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

2. An abstract class can have instance variables, but an interface cannot.

3. An abstract class can be extended using the "extends" keyword, while an interface can be implemented using the "implements" keyword.

4. A class can only extend one abstract class, but it can implement multiple interfaces.

5. Abstract classes are useful when you want to create a common behavior for a group of related classes, while interfaces are useful when you want to define a contract that classes must adhere to.

Why And How Java Continues To Be One Of The Most Popular Enterprise Coding Languages

 Java was created over 25 years ago, and it is still one of the most popular programming languages. In this article, I will present an overview of how Java has grown to today's complex system and why it continues to remain a contemporary development environment.

According to The PYPL PopularitY of Programming Language Index, in February 2022, Java was the second most popular language in the world, and its use has grown by 1.2% compared to February 2021. This ranking is determined by analyzing requests for language tutorials on Google.