In this article, we will discuss the frequently asked Core Java interview questions.
As probably you know that Core Java is base for any other Java-related technologies and frameworks. Every interviewer look for a candidate who has strong Core Java skillset.
In this article, I would like to share my experience with interviews from a small organization to MNC companies.
Check out my top articles related to Core Java interview preparation:
As probably you know that Core Java is base for any other Java-related technologies and frameworks. Every interviewer look for a candidate who has strong Core Java skillset.
In this article, I would like to share my experience with interviews from a small organization to MNC companies.
Check out my top articles related to Core Java interview preparation:
- Top 10 Java main() Method Questions
- 25+ OOPS Interview Questions
- 25+ Java 8 Interview Questions
- 25+ Java String Interview Questions
- 25+ Java Exception Handling Questions
Here I will list out frequently asked Core Java interview questions that have been asked for me as well as my friends.
- How HashMap works internally? [Solution]
- What is the difference between Comparable and Comparator interface? [Solution]
- What are oops principles? [Solution]
- What are SOLID Principles?[Solution]
- How to make the class as immutable?[Solution]
- What is Serialization?[Solution]
- What is Synchronization?[Solution]
- What is fail-safe vs fail-fast Iterator in Java?[Solution]
- What are Java 8 Features?[Solution]
- What is the use of Lambda Expression?[Solution]
- What is the use of Stream?[Solution]
- What is the difference between Interface and Abstract class?[Solution]
- What is a.hashCode() used for? How is it related to a.equals(b)?[Solution]
- Why you need to override hashcode when you override equals in Java?[Solution]
- What is the contract between equals and hashcode method?[Solution]
- Difference between ArrayList and LinkedList in Java?[Solution]
- What is the difference between Hashtable and HashMap?[Solution]
- Can two equal object have the different hash code?[Solution]
- What is the use of Serialize ID?[Solution]
- What is the difference between String, StringBuilder, and StringBuffer?[Solution]
- How to make a checked exception?[Solution]
- How to make an unchecked exception?[Solution]
- How to create custom exceptions?[Solution]
- What is ConcurrentHashMap?[Solution]
- What is the difference between Hashtable and ConcurrentHashMap?[Solution]
- Can we override a static method? if no then why?[Solution]
- What is fail fast and fail-safe in java?[Solution]
- Why String is immutable in java?[Solution]
- Why multiple inheritances are not supported in Java?[Solution]
- How to detect deadlock and fix it?[Solution]
- What is singleton and write code for singleton pattern?[Solution]
- Difference between noclassdeffounderror and classnotfoundexception?[Solution]
- Explain race condition in Java hashmap?[Solution]
- Can we call a static method with a null object?[Solution]
- How does volatile variable works in Java?[Solution]
- What is a thread local variable in Java?[Solution]
- Write code for thread-safe Singleton in Java?[Solution]
- The difference between sleep and wait in Java?[Solution]
- What is an immutable object? How do you create an Immutable object in Java?[Solution]
- Please share your interview questions at the comment section so that it will help others to prepare for an interview.
This is an extremely useful post for us. Thanks for sharing!
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