Preparing for a technical interview? This guide covers the most commonly asked Java interview questions to help you crack coding rounds with confidence. Whether you’re a fresher or have some experience, these questions are tailored to boost your chances of success in Java-based technical interviews
Core Java Concepts:
- Why is Java a platform independent language?
- What is the difference between an abstract class and an interface?
- What is the difference between final, finally, and finalize?
- What is the difference between stack and heap memory?
- What is the difference between method overloading and method overriding?
- What is the difference between an abstract class and an interface?
- What is the difference between a private and a protected modifier?
- What is constructor overloading in Java?
- What is the use of super keyword in Java?
- What is the difference between static methods, static variables, and static classes in Java?
- What exactly is System.out.println in Java?
- What part of memory – Stack or Heap – is cleaned in the garbage collection process?
Object-Oriented Programming:
- What are the Object Oriented Features supported by Java?
- What are the different access specifiers used in Java?
- What is the difference between composition and inheritance?
- What is the purpose of an abstract class?
- What are the differences between constructor and method of a class in Java?
- What is the diamond problem in Java and how is it solved?
- What is the difference between local and instance variables in Java?
- What is a Marker interface in Java?
Data Structures and Algorithms:
- Why are strings immutable in Java?
- What is the difference between creating a String using new() and as a literal?
- What is the Collections framework?
- What is the difference between ArrayList and LinkedList?
- What is the difference between a HashMap and a TreeMap?
- What is the difference between a HashSet and a TreeSet?
- What is the difference between an Iterator and a ListIterator?
- What is the difference between an ArrayList and a LinkedList?
- What is the purpose of the Comparable interface?
- What is the difference between a HashSet and a TreeSet?
- What is the purpose of the java.util.concurrent package?
Exception Handling:
- What is an exception?
- How does an exception propagate throughout the Java code?
- What is the difference between checked and unchecked exceptions?
- What is the use of try-catch block in Java?
- What is the difference between throw and throws?
- What is the use of the finally block?
- What’s the base class of all exception classes?
- What is Java Enterprise Edition (Java EE)?
- What is the difference between a Servlet and a JSP?
- What is the purpose of the Java Persistence API (JPA)?
- What is the difference between stateful and stateless session beans?
Multithreading:
- What is a thread and what are the different stages in its lifecycle?
- What is the difference between process and thread?
- What are the different types of thread priorities available in Java?
- What is context switching in Java?
- What is the difference between user threads and Daemon threads?
- What is synchronization?
- What is a deadlock?
- What is the use of the wait() and notify() methods?
- What is the difference between a thread and a process in Java?
- What is the difference between synchronized and volatile in Java?
- What is the purpose of the sleep() method in Java?
- What is the difference between wait() and sleep() in Java?
- What is the difference between notify() and notifyAll() in Java?
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