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

Core Java Interview Questions

Questions Answers Views Company eMail

Implement two stacks using a single array.

Global Logic,

1061

What is the use of 'super' keyword inside a constructor?

Flextronics, Thomson Reuters, Virtusa,

972

What is the method to declare member of a class static?

HCL,

1009

What is Mutex (Mutual Exclusion Object) ?

Ciena,

1152

Give differences between Quicksort &Mergesort. When should these sorts be used andwhat is their running time in java?

Genpact,

1241

What do you mean by JVM?

Ericsson,

1080

When does a class need a virtual destructor?

Flextronics,

1015

How is tree Mirroring implemented?

Fidelity,

1079

How can u increase the heap size in the memory?

Infosys,

1020

What do you understand by abstract classes?

HCL,

1075

How do you implement tree mirroring in java?

EXL, HCL,

1077

Explain the key functions of data binding?

Akamai Technologies, Aspire, Impetus, Infogain, Tavant Technologies, Virtusa,

1021

What is Major and importance difference between for and foreach loop ?

Infosys,

1151

What is the use of generics? When was it added to the Java development Kit?

Impetus,

1019

Explain the difference between a Thread and a Process.

Ciena,

1000

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Un-Answered Questions { Core Java }

What is generic class?

1092

Explain about collection interface in java?

991

What are the basic control structures?

988

How do you use nextline in java?

976

Describe the various concepts related to object oriented programming (oop).

1030

What is public static void main?

1105

What are different types of control structures?

977

What is a java object and java application?

1053

Is space a character in java?

1008

Why java doesn’t support multiple inheritances?

1054

What's the difference between comparison done by equals method and == operator?

972

Can a string be null?

986

Given a singly linked list, determine whether it contains a loop or not without using temporary space?

988

Define iterator and methods in iterator?

966

Difference between operator overloading and function overloading

1063

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