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,

995

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

Aspiring Minds,

939

What are the concepts of 'OOPS'?

Atos Origin,

1035

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

Ericsson,

1037

What will happen when using pass by reference in java?

HCL,

950

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

Infosys,

941

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

Fidelity,

1010

What is Gang of four design patterns

Infosys,

1001

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

Flextronics, Hexaware,

951

What is a default constructor and also define copy contrucyor?

Global Logic,

1061

Why use string handling in Java?

HCL,

1002

Explain heap sort?

Flextronics,

1058

What are recursive functions? Give some examples?

Axtria, ITC Indian Tobacco Company,

1150

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

Flextronics, Hexaware,

1015

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

Flextronics, Hexaware,

999

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Un-Answered Questions { Core Java }

What are the advantages of java inner classes?

1030

What is the purpose of the System class?

965

What happens if an exception is throws from an object's constructor?

1091

why would you use a synchronized block vs. Synchronized method? : Java thread

912

What is prefix of a string?

990

How do you include a string in java?

942

What is time complexity java?

961

What is boolean data type in java?

945

What is a condition in java?

955

What is the difference between a checked and an unchecked exception?

944

What is static and final keyword in java?

995

Why we use protected in java?

939

What is your platform?s default character encoding and how to know this?

2337

What is polymorphism java example?

958

Explain static nested classes ?

1061

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