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 an object’s lock and which object’s have locks?

971

What will be the output of round(3.7) and ceil(3.7)?

1125

How do you decide when to use arraylist and linkedlist?

1001

Which object oriented concept is achieved by using overloading and overriding?

1131

What are the advantages of arraylist over arrays?

1106

Which class represents the socket that both the client and server use to communicate with each other?

1053

What is the difference between yielding and sleeping?

1132

What are the access modifiers in java?

1053

Break statement can be used as labels in java?

1018

What are encapsulation, inheritance and polymorphism?

1031

I want my class to be developed in such a way that no other class (even derived class) can create its objects. Define how can I do so?

1187

Difference between static and dynamic class loading.

1141

How can we find the actual size of an object on the heap?

1323

Does java allow default arguments?

1006

Define how does a try statement determine which catch clause should be used to handle an exception?

1180

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Un-Answered Questions { Core Java }

How will you add panel to a frame?

1127

Why collection doesn’t extend cloneable and serializable interfaces?

1117

v-model life cycle

2052

What are constructors in java?

1129

What is thread pool in java with example?

1021

What is Enum in Java?

1328

What variables are stored in stack?

993

How do you differentiate abstract class from interface?

976

Are private methods final?

916

How do you ensure that n threads can access n resources without deadlock?

1324

What is the purpose of the system class in java programming?

1118

What is the purpose of a default constructor?

1107

Explain about exception propagation?

1059

What is runtime polymorphism or dynamic method dispatch?

1020

What is called module?

987

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