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Java Interview Questions Java Interview Questions Tips Top 55 Core Java Interview Questions

743 views · Published 16 October 2013 · 6:13 · Indexed 14 November 2026

Channel: Interview DOT · 2013 · Science & Technology

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Top  55 Core Java Interview Questions :

What is the difference between an Interface and an Abstract class ? 
What is the purpose of garbage collection in Java, and when is it used ?   
Describe synchronization in respect to multithreading ?
What are pass by reference and passby value ? 
Difference between HashMap and HashTable ? 
Difference between Vector and ArrayList ? 
What is static keyword in java ? 
What do you mean by platform independence ?
What is the difference between a JDK and a JVM ?
What is Singleton class ? 
What is finalize() method ? 
What is an Exception ,Checked Exceptions,Runtime Exceptions ? 
When throws keyword is used ?
How finally used under Exception Handling ?  
What is Polymorphism ?
Define immutable object ? 
What is Comparable Interface ? 
Explain the Java Program : public static void main (String args[ ]) ?
What is static block ? 
What is function overloading ? 
What is function overriding ? 
What is final class ? 
What is NullPointerException ? 
What invokes a thread's run() method ?
Does it matter in what order catch statements for FileNotFoundException and IOException are written ? 
What is the difference between yielding and sleeping ? 
What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy ? 
What is Serialization and deserialization ? 
What's the difference between constructors and other methods ? 
What's the difference between the methods sleep() and wait()? 
What is a transient variable ? 
What is synchronization ? 
What will happen if static modifier is removed from the signature of the main method ? 
What is the difference between error and an exception ? 
Is it necessary that each try block must be followed by a catch block ? 
What are synchronized methods and synchronized statements ? 
Where and how can you use a private constructor ? 
Describe life cycle of thread ? 
Why Generics are used in Java ? 
If System.exit (0); is written at the end of the try block, will the finally block still execute ? 
Why Strings are immutable ?
How to make a java class immutable ?
Deep copy and shallow copy ?
What is synchronization? Object level locking and class level locking ?
Can you assign null to this reference variable ? 
How to override equals and hashCode() methods ?
What happens to the static fields of a class during serialization ? 
How are Observer and Observable used ?
What is OutOfMemoryError in java ? 
How to deal with java.lang.OutOfMemeryError error ?
What is the use of the finally block ? Is finally block in Java guaranteed to be called ? When finally block is NOT called ?
What is Marker interface ? How is it used in Java ?
Can you make constructor final ?
Can we synchronize the constructor of a Java Class ?
How many types of memory areas are allocated by JVM ?
What is Java classloader ? Explain ?

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