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,

1032

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

Aspiring Minds,

990

What are the concepts of 'OOPS'?

Atos Origin,

1075

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

Ericsson,

1090

What will happen when using pass by reference in java?

HCL,

992

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

Infosys,

984

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

Fidelity,

1052

What is Gang of four design patterns

Infosys,

1055

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

Flextronics, Hexaware,

1005

What is a default constructor and also define copy contrucyor?

Global Logic,

1111

Why use string handling in Java?

HCL,

1030

Explain heap sort?

Flextronics,

1123

What are recursive functions? Give some examples?

Axtria, ITC Indian Tobacco Company,

1193

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

Flextronics, Hexaware,

1060

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

Flextronics, Hexaware,

1052

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Un-Answered Questions { Core Java }

What is string buffer?

943

why are wait(), notify() and notifyall() methods defined in the object class? : Java thread

990

What is the java reflection api? Why it’s so important to have?

980

Explain 5 io best practices?

1034

How we can make copy of a java object?

1100

What is the difference between class & structure?

1228

What Is Query Throttling in java?

999

What are the types of literals?

1188

How many bits is a boolean?

1089

What does super keyword do?

1073

What is use of set in java?

1005

Can java arraylist hold different types?

1076

Can we create an object of private class?

971

Describe 2 different ways to concatenate two strings.

1204

How can I become a good programmer?

983

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