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?

5 658

What is the default value stored in Local Variables?

5 649

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

5 575

Is it possible to make an array volatile?

4 659

What is an object-oriented paradigm?

5 619

What are the Memory Allocations available in JavaJava?

1 397

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

2 423

Can you explain the Java thread lifecycle?

1 452

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

1 501

What is JDK? Mention the variants of JDK?

1 383

What are Brief Access Specifiers and Types of Access Specifiers?

1 401

Explain Method Overloading in Java.

1 440

Give a briefing on the life cycle of a thread.

1 400

Brief the life cycle of an applet.

1 325

What are the observer and observable classes?

1 525

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Un-Answered Questions { Core Java }

is there a separate stack for each thread in java? : Java thread

788

What does nullpointerexception mean?

869

What are pass by reference and pass by value?

720

Given a singly linked list, how will you print out its contents in the reverse order? Can you do it with consuming any extra space?

814

what is thread? What are the high-level thread states? : Java thread

1037

Are primitives objects?

802

Explain the difference between runnable and callable interface in java?

829

What do you mean by compiler?

825

Do we have pointers in java?

731

What is a dot notation?

781

Can you sort a list in java?

747

What is a data structure java?

773

Why there are some null interface in java? What does it mean?

886

What is a percentage sign called?

832

What is string builder in java?

779

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