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

Core Java Interview Questions

Questions Answers Views Company eMail

Is java map thread safe?

954

Is array dynamic in java?

928

Does java set allow duplicates?

1077

Can we increase array size dynamically in java?

945

How to store image in arraylist in java?

972

How do you delete a list in java?

947

Can we declare an array without size in java?

994

Does java map allow duplicates?

893

Can java arraylist hold different types?

1067

Is arraylist sorted in java?

1000

How do you remove duplicates in java?

1013

How does compareto work in java?

1036

Is int a class in java?

985

How does arraylist size increase in java?

1108

How do you reverse sort in java?

941

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Un-Answered Questions { Core Java }

What is function and method in java?

946

What is replacefirst in java?

1100

Why is serialization required?

953

What are identifiers in java?

1119

Explain about the performance aspects of core java?

1053

Is there is any difference between a scrollbar and a scrollpane?

987

What do you understand by the term singleton?

994

When can an object reference be cast to an interface reference in java programming?

1018

What is the default size of load factor in hashing based collection?

1044

What is the use of volatile in java?

1055

Write the algorithm to check the number non-leaf nodes in a tree.

1064

What do you understand by classes in java?

1003

Explain differences between checked and unchecked exceptions in java?

1059

Tell some latest versions in JAVA related areas?

984

What is the use of toarray () in java?

1064

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