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 do you meant by Runtime Polymorphism?

BVIMR, IBM, Persistent,

13 36112

How to call static method?

Epoch,

4 8857

Difference between ?System.out.println? and ?System.error.println??

Sai Softech,

8 28536

Difference between abstract class and Interfaces?

CTS, iFlex, PA Consulting, Sai Softech, Value Chain,

7 16686

what is the use of declaring constructor as private?

Cyient, IVY Technologies, Sai Softech, Virtusa,

5 15153

Difference between array and arraylist.

Arise Solution, Banca Sella, iFocus, NIC, Sai Softech, Solartis, TCS, Verizon,

23 156932

Difference between Hash Table and Hash Map?

Persistent,

10 22895

Features of Java?

4 7268

Difference between overloading and overridding?

4 8932

Keywords in Exceptions?

2 5327

write the hierarchy of component class?

1 4236

what are the differences between final,finally,finalize methods?

IBM,

14 50765

what is the difference between multitasking and multithreading?

TCS,

21 81650

why java is not supporting multiple inheritence?

3 6448

what are the diffrences between interface and abstract class?

4 7909

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Un-Answered Questions { Core Java }

Define max and min heap, also the search time of heap.

1038

Explain what access modifiers can be used for methods?

1102

What is the purpose of final keyword and when to use it?

1016

How do you check if an arraylist is not empty?

1139

What is a instance variable?

1074

Using callable statement how can you pass out parameters, explain with example?

1247

How do I compare two strings in word in java?

1009

What is the difference between a constructor and a method?

1272

What is use of super keyword?

984

What are thread safe functions?

965

What is a double vs float?

1031

Can a class have multiple subclasses?

1122

What is the definition of tree ?

1069

Is it safe to install java on my computer?

1161

Can we use catch statement for checked exceptions?

981

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