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?

1051

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

1035

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

978

When the constructor of a class is invoked?

981

What is ternary operator? Give an example.

1022

How an object is serialized in java?

934

When we should use serialization?

968

What's the base class of all exception classes?

1015

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

1270

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

908

What is the access scope of protected access specifier?

935

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

994

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

930

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

957

What is final keyword in java? Give an example.

952

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Un-Answered Questions { Core Java }

What does a method signature consist of?

925

how its run?

1008

Define immutable object?

1008

How many types of design patterns are there?

1045

what is collatration?

3234

What is the file type?

967

Is there a case when finally will not execute?

944

how can you catch multiple exceptions in java?

971

What are the advantages of exception handling?

1012

How destructors are defined in java?

1123

What is string made of?

917

What is the difference between processes and threads?

995

When would you use a static class?

922

What do you meant by active and passive objects?

1019

How do you use compareto in java?

928

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