Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Why null interfaces are used in Java?

2 8360

What is a Wrapper class?

14 44139

Write a program for recursive Traverse?

1 6193

Write a program to create a binary Tree ?

2 9117

what are Hostile Applets?

2082

what is a transient variable?

5 11543

what is the JNDI?

3 6620

What JNDI(Java Naming and Directory Interface) provides?

4 7354

Explain, why the constructor is required in implemented class?

4 8000

is java support call by reference and call by value, if supports please explain?

5 21863

what is the difference between the "protected and default" modifiers?

8 23951

where u use Abstraction and Interface in real time

Sonata,

3 8905

Difference between JDK, JRE, JVM

Deloitte, HCL, Mind Tree, Oracle, Reliance, TCS, ThinkBox,

16 96545

what do you meant by Platform-Independent?

Persistent,

6 13730

Why Java is not purely object oriented?

Elitecore, Persistent, Reliance, Wipro,

50 78464

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Un-Answered Questions { Core Java }

How will you print number in reverse (descending) order in BST.

982

How use .contains in java?

1174

What is oop in java?

1059

what are the disadvantages of indexes in oracle?

2554

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

1089

Can constructor be inherited?

1036

How java enabled high performance?

1051

what do you mean by marker interface in java?

983

Can memory leak happen java?

1005

Explain 5 features introduced in jdk 1.7?

1028

How to instantiate static nested classes in java?

1089

What are alternatives to java serialization?

1126

Can you override private or static method in java?

976

Which is faster set or list in java?

1033

What technique is carried out to find out if a particular string is empty?

1015

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