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

Core Java Interview Questions

Questions Answers Views Company eMail

Can we declare Pointer in Java?

5 1403

What is the default value stored in Local Variables?

5 1350

Difference in the use of print, println, and printf.

5 1136

Is it possible to make an array volatile?

4 1268

What is an object-oriented paradigm?

5 1313

What are the Memory Allocations available in JavaJava?

1 693

What is a singleton class in Java? And How to implement a singleton class?

2 792

Can you explain the Java thread lifecycle?

1 809

In the below Java Program, how many objects are eligible for garbage collection?

1 967

What is JDK? Mention the variants of JDK?

1 797

What are Brief Access Specifiers and Types of Access Specifiers?

1 782

Explain Method Overloading in Java.

1 843

Give a briefing on the life cycle of a thread.

1 762

Brief the life cycle of an applet.

1 626

What are the observer and observable classes?

1 934

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Un-Answered Questions { Core Java }

What is covariant return type?

1056

What is general methodology?

979

What is palindrome in java?

928

What is difference between next () and nextline () in java?

937

Can we have more than one package statement in the source file?

1020

what do you understand by the term string with respect to java?

976

Write a program to calculate factorial in java?

953

What is the difference between final, finally and finalize()?

1058

What is difference between fileinputstream and filereader in java?

993

What is local variable and instance variable?

998

What is the default size of arraylist in java?

1009

What is boolean logic?

967

Write java program to reverse string without using api?

980

Difference between serialization and deserialization in java?

1076

What is the benefit of using enum to declare a constant?

1038

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