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?

1101

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

1027

When the constructor of a class is invoked?

1034

What is ternary operator? Give an example.

1082

How an object is serialized in java?

991

When we should use serialization?

1025

What's the base class of all exception classes?

1064

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?

1001

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

1058

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

983

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

1016

What is final keyword in java? Give an example.

1016

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Un-Answered Questions { Core Java }

What is consumer in java?

979

Can a class have 2 constructors?

900

What is the purpose of using bufferedinputstream and bufferedoutputstream classes?

1072

Explain why wait(), notify() and notifyall() methods are in object class rather than in the reading class?

987

What is a linkedhashmap java?

1006

What is an example of procedure?

1039

What are static methods?

1054

What occurs when an object is constructed?

1007

What are 4 pillers of object orinted programming?

1017

What is the use of default method in interface in java? Explain

1006

How are variables stored?

986

What is the final keyword denotes?

1112

Highest level event class of the event-delegation model?

4015

What is "this" keyword in java? Explain

1102

What is use of set in java?

1006

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