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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


Post New Core Java Questions

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