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Core Java important interview questions for Java Programmer

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Top Core Java Interview Questions

    Core Java important interview questions for Java Programmer

1- How JVM works?How memory allocation happens in Java?

JVM Runtime Memory Allocation


What is the abstraction in Java? How to achieve abstraction in Java?


What is Runtime Polymorphism?Write code and explain.
What is the difference between JAR, WAR and EAR?
What the new features in Java 8?
Explain HashMap internal implementation.How concurrent Hashmap works?

Internal implementation of HashMap in Java


What is the difference between HashMap and HashTable?
Where null key get stored in HashMap?
What is the difference between ArrayList and LinkedList? How to remove an element from the LinkedList?
What is load factor in HashMap?
How HashSet works?What is hashcode and equals method?
Explain Exception hierarchy in Java?
How to create a custom exception in Java?
Why is String is immutable in Java? How to make a class immutable in Java?
Explain creation of String object in Java.What is intern() method?
What is the difference between StringBuffer and StringBuilder?

What are the different ways to create a thread in Java?

Different ways to create thread in Java

What is ExecutorService in Java?What is a future object?

What is the use of synchronize keyword in Java?
What is the difference between Runnable and Callable?
What is serialization in Java?How marker interface works in Java?
How to do serialization in Java?

Serialization in Java


What is a transient keyword in Java?How transient keyword works internally?
What is a serialVersionUID?
What is Externalizable in Java?
Write a code to create JDBC connection?
What is the difference between PreparedStatement and Statement?
What is the difference between Hashtable and synchronize HashMap?
When to use synchronize block and synchronize method?

Synchronization in Java -  Synchronized keyword


Exception Handling in Java
What is a runtime error?
What is classloader?
Binary search complexity.
How to resolve an issue with the Factory Design Pattern?
What is Functional Interface? How to implement?
Singleton Design Pattern?
Bubble Sorting and Complexity?
How to handle null pointer exception?








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Core Java important interview questions for Java Programmer Core Java important interview questions for Java Programmer Reviewed by JavaInstance on 7:10:00 AM Rating: 5

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