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,

1071

Detail discussions on JVM, memory management and garbage collector.

Expedia,

989

How can we make a class virtual?

Fidelity,

1119

What are the basic concepts of OOPS in java?

Axtria, ITC Indian Tobacco Company,

1043

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

Global Logic,

1013

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

Genpact,

1071

Write a function for palindrome and factorial and explain?

Honeywell, Huawei, Zomato,

1081

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

Global Logic,

1098

Why main function is static?

MCN Solutions,

1257

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

Flextronics,

1179

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

GrapeCity,

989

What is meant by data hiding in java?

Aspire, Infogain,

1162

What is OOP Language?

Atos Origin,

1081

Differentiate between postfix and prefix operators in java.

HCL,

1132

Which are different kinds of source code?

1116

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Un-Answered Questions { Core Java }

Differentiate between stringbuffer and stringbuilder in java.

1033

What does a za z0 9 mean?

1107

What is udp in java?

990

How does hashset work in java?

1130

why doesn't java run on all platforms?

1036

What are java threads?

1139

Write a program to reverse a number in java?

1100

Which is a valid identifier?

1220

Give some features of interface?

1071

Differentiate between == and equals().

1055

What is http client in java?

1097

Why a dead thread occurs?

986

What is a cup of java?

1024

How to change the priority of thread or how to set the priority of thread?

1041

What is generic class?

1098

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