Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

What differences exist between iterator and listiterator?

1057

Explain the differences between abstraction and encapsulation?

1065

What is autoboxing and unboxing?

1030

What is the importance of finally block in exception handling?

1050

What is the difference between exception and error in java?

1035

Can you override private or static method in java?

995

What is comparable and comparator interface? List their differences

1117

How does thread synchronization occurs inside a monitor? What levels of synchronization can you apply?

974

Why is java called the platform independent programming language?

1025

What are the data types supported by java?

1042

What does system.gc() and runtime.gc() methods do?

1071

How do you ensure that n threads can access n resources without deadlock?

1327

When is the finalize() called? What is the purpose of finalization?

1101

If an object reference is set to null, will the garbage collector immediately free the memory held by that object?

1170

Does garbage collection occur in permanent generation space in jvm?

1101

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Un-Answered Questions { Core Java }

What is udp in java?

996

What is a null point?

1098

Why string objects are immutable in java?

1056

What is a blocking method in Java?

1261

Explain how to force the garbage collection in java.

982

How do you do math powers in java?

1075

What is formatted output in java?

982

Implement 2 stacks with just 1 array. The stack routines must not indicate overflow unless every slot in array is used.

1340

What is the difference between overriding and overloading in OOPS.

1178

Why is static used?

1041

Can we override tostring method in java?

983

What is a consumer in java?

1031

Why string is not thread safe?

1024

What is the right data type to represent a price in java?

968

What is a default constructor and also define copy contrucyor?

1125

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