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,

1084

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

Aspiring Minds,

1033

What are the concepts of 'OOPS'?

Atos Origin,

1119

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

Ericsson,

1138

What will happen when using pass by reference in java?

HCL,

1044

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

Infosys,

1032

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

Fidelity,

1103

What is Gang of four design patterns

Infosys,

1115

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

Flextronics, Hexaware,

1056

What is a default constructor and also define copy contrucyor?

Global Logic,

1166

Why use string handling in Java?

HCL,

1079

Explain heap sort?

Flextronics,

1175

What are recursive functions? Give some examples?

Axtria, ITC Indian Tobacco Company,

1251

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

Flextronics, Hexaware,

1112

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

Flextronics, Hexaware,

1105

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Un-Answered Questions { Core Java }

What is the protected method modifier?

1091

What do you know about the garbage collector in java?

1136

What do you mean by jjs in java8?

1067

What are use cases?

1019

What are the types of inner classes (non-static nested class) used in java?

1113

Is a boolean variable?

1066

Can we override compareto method?

995

What is private protected in java?

1100

What is the advantage of OOP in java?

1209

Explain java code for recursive solution's base case?

1091

why java does not support unsigned keyword?

5344

Difference between stack and queue?

1140

What is the generic class?

1020

How many threads can I run java?

1181

What are the main features of java?

1022

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