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 array and arraylist in java?

1129

Can a hashset contain duplicates java?

992

Which collection is thread safe in java?

1007

Which collection is best for sorting in java?

1140

What is the maximum size of arraylist in java?

1022

What is the size of arraylist in java?

1039

What is use of arraylist in java?

1200

Which java collection does not allow null?

1174

What is listnode in java?

1008

Which collection does not allow duplicates in java?

991

What is arraylist e in java?

1072

What is difference between arraylist and list in java?

1101

Is null or empty java?

1001

What is thread synchronization in java?

913

Which is the class in java?

1080

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Un-Answered Questions { Core Java }

Why string is a class?

970

Where is the singleton class used?

1049

What is the declaration statement?

964

How many bytes are there?

1026

How do you execute a thread in java?

969

What is return in java?

990

What are thread groups?

1014

What is run time allocation?

1042

Difference between Linked list and Queue?

1044

What means public static?

1061

Where is java located?

1070

Why put method is idempotent?

929

What is a default constraint?

1086

List out five keywords related to exception handling ?

1031

What is the return type of the main method?

1056

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