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,

1073

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

Flextronics, Thomson Reuters, Virtusa,

982

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

HCL,

1020

What is Mutex (Mutual Exclusion Object) ?

Ciena,

1161

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

Genpact,

1251

What do you mean by JVM?

Ericsson,

1092

When does a class need a virtual destructor?

Flextronics,

1028

How is tree Mirroring implemented?

Fidelity,

1086

How can u increase the heap size in the memory?

Infosys,

1033

What do you understand by abstract classes?

HCL,

1082

How do you implement tree mirroring in java?

EXL, HCL,

1084

Explain the key functions of data binding?

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

1026

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

Infosys,

1158

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

Impetus,

1026

Explain the difference between a Thread and a Process.

Ciena,

1009

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Un-Answered Questions { Core Java }

What are reference variables in java?

1133

What is the purpose of sizeof operator?

1064

List some features of the abstract class.

1078

What is boolean logic?

1030

Is it possible to compare various strings with the help of == operator? What are the risks involved?

1080

Can we sort a map in java?

1058

Why deletion in linkedlist is fast than arraylist?

1111

What are singleton services?

923

What is substring in java?

1237

What is bubble sorting in java?

1058

What will be the output of round(3.7) and ceil(3.7)?

1121

What are the types of inner classes (non-static nested class) used in java?

1074

What is a methodologist?

1079

What is the benefit of inner / nested classes ?

998

Is empty set an element of empty set?

1113

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