Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Explain the meaning of java applet.

TCS,

1132

What is java Applet?

TCS,

1157

Tell me a few examples of final classes defined in Java API?

DELL,

1165

How many JVMs can run on a single machine and what is the meaning of Just-In-Time (JIT) compiler?

TCS,

1551

Given a singly linked list, determine whether it contains a loop or not without using temporary space?

Global Logic,

1034

Is Constructor possible in abstract class in java ?

HCL,

1118

Give us a program to check for parenthesis matching using stack.

Genpact,

1050

What is the Concept of Encapsulation in OOPS

HCL,

1034

How can you read an integer value from the keyword when the application is runtime in java? example?

HCL,

1200

State differences between C and Java?

Deloitte, JPMorgan Chase,

1267

Differentiate storage classes on the basis of their scope?

Fidelity,

1242

What are "class access modifiers" in Java?

Genpact,

1208

How are multiple inheritances done in Java?

Atos Origin,

1204

Can we force garbage collector to run ?

B-Ways TecnoSoft,

1106

What is the difference between overriding and overloading in OOPS.

Axtria, ITC Indian Tobacco Company,

1208

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Un-Answered Questions { Core Java }

What is a static class in java?

1059

What is foreach loop in java?

1072

What is encapsulation in java?

1175

Can a class be a super class and a sub-class at the same time? Give example.

1620

Implement a stack with push (), pop() and min() in O(1) time.

1164

What is a lambda expression ? What's its use ?

1162

What is the difference between a constructor and a method?

1334

Does treeset use compareto?

1024

Is upper case in java?

1010

Why java is called not pure object oriented language?

1077

State the difference between strings and arrays.

1329

What is an argument in java?

989

What is the generic function?

1041

What languages are pass by reference?

1111

Explain about join() method?

1028

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