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,

1017

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

Flextronics, Thomson Reuters, Virtusa,

922

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

HCL,

976

What is Mutex (Mutual Exclusion Object) ?

Ciena,

1098

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

Genpact,

1191

What do you mean by JVM?

Ericsson,

1024

When does a class need a virtual destructor?

Flextronics,

964

How is tree Mirroring implemented?

Fidelity,

1021

How can u increase the heap size in the memory?

Infosys,

964

What do you understand by abstract classes?

HCL,

1028

How do you implement tree mirroring in java?

EXL, HCL,

1031

Explain the key functions of data binding?

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

971

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

Infosys,

1098

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

Impetus,

982

Explain the difference between a Thread and a Process.

Ciena,

957

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Un-Answered Questions { Core Java }

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

992

What is nullpointerexception in java?

1065

what is server side caching?

2116

What is map java?

927

What's the purpose of static methods and static variables?

1054

What is mean by collections in java?

1105

Which collections are thread safe in java?

892

What is equlas() and hashcode() contract in java? Where does it used?

1077

What is difference between call by value and call by reference?

953

What restrictions are placed on method overriding?

1121

What is the flag in java?

1014

Are arrays immutable in java?

1030

What are different ways of object creation in java ?

1037

What is parsing in grammar?

989

How to do a true java ping from windows?

1077

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