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

Core Java Interview Questions

Questions Answers Views Company eMail

A class can be a subclass of itself?

Genesis,

2 10673

Are nested try statements are possible?

2 5292

Is multiple inheritance allowed in Java? Why ?

7 12165

Is 'null' a keyword?

8 10184

Is 'sizeof' a keyword?

7 17970

Does any tag exists in HTML to upload and download files ?

3 8394

Are there any tools available in java to create reports?

5 9499

Explain Connection Pooling?

3 9203

What classes can be used to store arbitrary number of objects ?

1 4192

Can you give names of Container classes?

Ordain Solutions,

2306

What are the names of interfaces that doesn't consists of method/s ?

3 7803

What primitive Java types? Howmany are they and what are their names?

3 5828

What are the names of Component subclasses that support painting?

1 3777

What are teh sub-classes of a component class?

2 5042

Name two subclasses of the TextComponent class?

2 6948

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Un-Answered Questions { Core Java }

What is Java Reflection API? Why it’s so important to have?

1165

Can you inherit from an abstract class java?

995

What are methods in java?

995

Why does java doesnt suuport unsigned values?

2239

What is the difference between a window and a frame in java programming?

1139

What is the difference between dom and sax parser in java?

975

what is abstract class in Java?

1119

What is Mutex (Mutual Exclusion Object) ?

1152

1.IN CASE OF DYNAMIC METHOD DISPATCH WHY WE USE REFERENCE VARIABLE,WE CAN USE THE DIFFERENT DEFINED OBJECT DIRECTLY TO ACCESS THE DATA MEMBER AND MEMBER FUNCTION OF THAT RESPECTIVE CLASS?WHAT IS THE MAIN FUNCTION OF "REFERENCE VARIABLE" HERE?

4954

Is void a data type in java?

988

Explain java heap space and garbage collection?

1075

What is static data type in java?

1032

How can u increase the heap size in the memory?

1020

What is the scope or life time of instance variables?

1118

What is anagram word?

997

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