Top Java Interview Questions You Need to Know as fresher #Java #interviewquestions #freshers

Basic questions asked in interview of java developer for fresher
As a fresher Java developer, you can expect interview questions that assess your understanding of core Java concepts, object-oriented programming (OOP), and basic programming skills. Below are some common categories and sample questions:

1. Core Java Concepts
• What is the Java Virtual Machine (JVM)?
• Explain the difference between JDK, JRE, and JVM.
• What are Java’s main features?
• What is the purpose of the main() method in Java?
• Explain the concept of a constructor in Java.

2. Object-Oriented Programming (OOP)
• What are the principles of OOP?
• Explain the difference between abstract classes and interfaces.
• What is method overloading and method overriding? Provide examples.
• What is inheritance? Can you give a real-life example?
• What is polymorphism in Java

3. Data Structures and Algorithms
• How would you reverse a string in Java?
• What are the different types of collections in Java?
• Explain the difference between ArrayList and LinkedList.
• How does a HashMap work in Java?
• Write a program to check if a number is prime.

4. Exception Handling
• What is exception handling in Java?
• What is the difference between checked and unchecked exceptions?
• What is the purpose of the finally block in a try-catch-finally construct?
• Can a try block be used without a catch block?
• Explain the throw and throws keywords in Java

5. Multithreading and Concurrency
• What is multithreading? How is it implemented in Java?
• Explain the difference between Thread class and Runnable interface.
• What is a synchronized block in Java?
• What are wait() and notify() methods used for?

6. Java Basics and Syntax
• What are the access modifiers in Java?
• Explain the static keyword in Java.
• What is the difference between == and .equals()?
• How are strings immutable in Java?
• What is the purpose of the final keyword in Java?

7. Programming Scenarios
• Write a program to check if a string is a palindrome.
• Write a program to sort an array of integers.
• Implement a simple calculator using switch-case.
• Write a program to find the factorial of a number using recursion.
• Write code to demonstrate how to read input from the console.

8. Database and SQL (if applicable)
• How do you connect Java with a database?
• What is JDBC?
• Write a simple program to fetch data from a database table.

9. Miscellaneous
• What is the difference between public, private, protected, and default access?
• Explain garbage collection in Java.
• What is the difference between a process and a thread?
• How do you handle memory leaks in Java?
• What is the purpose of the StringBuilder class?

10. Behavioral/HR Questions
• Why did you choose Java as your primary programming language?
• Can you describe a project you worked on using Java?
• What challenges did you face while learning Java?
• How do you keep yourself updated with new technologies?

Tips:
• Be clear on basic concepts like OOP principles, data structures, and common Java libraries.
• Practice simple coding problems on platforms like LeetCode, HackerRank, or GeeksforGeeks.
• Review real-world examples or projects you've worked on to discuss during interviews.

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