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 difference between Array and Hash Table?

Impetus,

1046

What are heap memory and stack memory and what are memory tables.

Aspiring Minds,

1000

What are the concepts of 'OOPS'?

Atos Origin,

1092

What is nested loop? What is dangling else condition in it?

Ericsson,

1103

What will happen when using pass by reference in java?

HCL,

1009

What is a concrete classes? Is Java object class is concrete class?

Infosys,

993

Given a singly linked list, find the middle of the list in a single traversal without using temporary variable.

Fidelity,

1062

What is Gang of four design patterns

Infosys,

1075

Can a constructor be private and how are this() and super() method used with constructor?

Flextronics, Hexaware,

1018

What is a default constructor and also define copy contrucyor?

Global Logic,

1121

Why use string handling in Java?

HCL,

1043

Explain heap sort?

Flextronics,

1134

What are recursive functions? Give some examples?

Axtria, ITC Indian Tobacco Company,

1210

How do you access command-line arguments within the code?

Flextronics, Hexaware,

1071

What is the difference between static and global variables and also define what are volatile variables?

Flextronics, Hexaware,

1071

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Un-Answered Questions { Core Java }

What are daemon Threads in java?

1216

What is an iterator interface in java programming?

977

What is method in research paper?

1154

What exactly is java?

954

What is java in simple terms?

1016

Explain about features of local inner class?

1144

How many types of constructors are used in java?

1205

What is the difference between an interface and an abstract class?

1020

How do you generate random numbers in java?

1021

What was java originally called?

969

Explain about main() method in java ?

1084

What is collection class in java? List down its methods and interfaces.

979

Is java type safe?

972

Is string a class?

1049

Why does java does not support multiple inheritance? Explain

990

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