Front

How does an abstract class differ from a regular class?

Back

An abstract class cannot be instantiated and may contain abstract methods that must be implemented by subclasses.

Front

What is the purpose of an interface in Java?

Back

To define a contract for classes to implement, allowing for abstraction and multiple inheritance.

Front

What does the super keyword do in Java?

Back

Allows access to the parent class's methods and variables.

Front

Choose the correct description of method overloading. Example: In a class, you can have a method 'add' that takes two integers and another 'add' that takes two doubles.

Back

Method overloading allows a method to be defined multiple times with the same parameters.

Front

What is the correct description of encapsulation in Java?

Back

Encapsulation allows changes to be made to the internal implementation without affecting external code.

Front

Can you override a static method in Java?

Back

No, you cannot override a static method in Java.

Front

What happens if a class does not implement all methods of an interface?

Back

The class will not compile due to missing method implementations.

Front

How can you achieve multiple inheritance in Java?

Back

Use interfaces.

Front

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

Back

An abstract class can have state, while an interface cannot.

Front

Explain the concept of dynamic method invocation in Java.

Back

Dynamic method invocation allows Java to resolve method calls at runtime, enabling polymorphism.