What are some common Java interview questions for freshers?

What are some common Java interview questions for freshers?

Some common Java interview questions for freshers include:

1. What is Java?
2. Explain the concept of OOP.
3. What are the main features of Java?
4. What is the difference between JDK, JRE, and JVM?
5. Can you explain exception handling in Java?

Can you explain the difference between JDK, JRE, and JVM?

Sure!

• JDK (Java Development Kit) is a software development kit used to develop Java applications. It includes JRE and development tools.
• JRE (Java Runtime Environment) provides the libraries and components necessary to run Java applications. It does not include development tools.
• JVM (Java Virtual Machine) is the engine that executes Java bytecode, converting it into machine code.

What is the concept of OOP?

OOP stands for Object-Oriented Programming. It is a programming paradigm based on the concept of "objects", which can contain data and code. The main principles of OOP are:

1. Encapsulation: Bundling data and methods that operate on the data.
2. Inheritance: Mechanism to create a new class using properties of an existing class.
3. Polymorphism: Ability to present the same interface for different underlying forms (data types).

What is exception handling in Java?

Exception handling in Java is a powerful mechanism to handle runtime errors, allowing the normal flow of the application to continue. It uses keywords like try, catch, and finally.

• A 'try' block contains code that might throw an exception.
• A 'catch' block handles the exception.
• A 'finally' block executes code after try-catch, regardless of whether an exception occurred.