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

Core Java Interview Questions

Questions Answers Views Company eMail

Can we use a default constructor of a class even if an explicit constructor is defined?

1106

What's the purpose of static methods and static variables?

1098

What is the difference between comparison done by equals method and == operator?

1024

When the constructor of a class is invoked?

1034

What is ternary operator? Give an example.

1082

How an object is serialized in java?

988

When we should use serialization?

1025

What's the base class of all exception classes?

1061

In multi-threading how can we ensure that a resource isn't used by multiple threads simultaneously?

1323

What are the two environment variables that must be set in order to run any java programs?

967

What is the access scope of protected access specifier?

999

A person says that he compiled a java class successfully without even having a main method in it? Is it possible?

1056

What's the purpose of using break in each case of switch statement?

983

What are java packages? What is the significance of packages?

1014

What is final keyword in java? Give an example.

1016

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Un-Answered Questions { Core Java }

What are the advantages of defining packages in java?

986

Is char a method in java?

1066

Explain about main() method in java ?

1069

How many arguments can be passed to main ()?

995

What is anagram word?

997

What is the dot operator?

1001

What is the use of singleton?

965

What is final variable?

945

What does s mean in regex?

1019

What does a boolean method return?

1234

What is string pool?

1125

What are the basic control structures?

988

Can a class be defined inside an interface?

1032

Name few java util classes introduced with java 8 ?

913

What is "this" keyword in java? Explain

1098

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