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,

1062

Detail discussions on JVM, memory management and garbage collector.

Expedia,

985

How can we make a class virtual?

Fidelity,

1114

What are the basic concepts of OOPS in java?

Axtria, ITC Indian Tobacco Company,

1036

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

Global Logic,

1008

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

Genpact,

1068

Write a function for palindrome and factorial and explain?

Honeywell, Huawei, Zomato,

1076

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

Global Logic,

1095

Why main function is static?

MCN Solutions,

1247

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

Flextronics,

1176

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

GrapeCity,

982

What is meant by data hiding in java?

Aspire, Infogain,

1158

What is OOP Language?

Atos Origin,

1073

Differentiate between postfix and prefix operators in java.

HCL,

1127

Which are different kinds of source code?

1111

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Un-Answered Questions { Core Java }

What is the ==?

887

What is a variable analysis?

1088

Why Java is not pure Object Oriented language?

1108

What is meant by singleton class?

1033

What all access modifiers are allowed for top class ?

1186

What is the benefit of inner classes in java?

1087

What are the three parts of a lambda expression? What is the type of lambda expression?

1033

What is the order of arraylist in java?

1137

What is the symbol for average?

1030

How do you identify independent and dependent variables?

1008

What is java lang object?

970

What is identifier in java?

1113

Find the value of a specified element of the array arr[i] where 0 <= i <= n-1

982

How infinite loop is declared?

1021

Explain 5 features introduced in jdk 1.7?

1028

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