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 is the reason behind using constructors and destructors?

HCL,

1113

Detail discussions on JVM, memory management and garbage collector.

Expedia,

1037

How can we make a class virtual?

Fidelity,

1185

What are the basic concepts of OOPS in java?

Axtria, ITC Indian Tobacco Company,

1091

What is garbage collection? Can it be forced to run?

Global Logic,

1066

Give differences between Quicksort & Mergesort. When should these sorts be used and what is their running time?

Genpact,

1141

Write a function for palindrome and factorial and explain?

Honeywell, Huawei, Zomato,

1143

What is the use of a conditional inclusion statement in Java ?

Global Logic,

1143

Why main function is static?

MCN Solutions,

1324

What are the characteristics of Final,Finally and Finalize keywords.

Flextronics,

1243

How will you print number in reverse (descending) order in BST.

GrapeCity,

1045

What is meant by data hiding in java?

Aspire, Infogain,

1222

What is OOP Language?

Atos Origin,

1126

Differentiate between postfix and prefix operators in java.

HCL,

1188

Which are different kinds of source code?

1171

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Un-Answered Questions { Core Java }

How to perform quicksort in java?

1198

Is 64bit faster than 32 bit?

1128

Does java runtime require a license?

1139

Can we write a class without main method in java?

1003

What are 5 boolean operators?

1259

What is thread pool in java with example?

1067

What is equals method in java?

1105

Give any two differences between C++ and java.

1208

Explain, java is compatible with all servers but not all browsers?

1110

What is sortedset in java?

1078

What is sizeof in java?

1173

What are the various access specifiers in java?

1055

How does split work in java?

1107

Is 0 true or is 1 true?

1010

Why wait(),notify(),notifyAll() methods defined in Object class althought we are using in only threads.

2899

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