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

Core Java Interview Questions

Questions Answers Views Company eMail

Which collections are thread safe in java?

939

Which data type is class in java?

1028

Why are arrays useful in java?

1046

What is a dynamic array in java?

1197

What is maximum size of arraylist in java?

1046

Which collection is sorted in java?

1050

What is entry set in java?

1173

What is difference between array and arraylist in java?

1010

What is hash table in java?

1047

What is the maximum size of byte array in java?

1033

What is hash in java?

1003

What is sortedmap in java?

1052

What is natural ordering in java?

981

What is initial size of arraylist in java?

1076

What is getkey () in java?

1021

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Un-Answered Questions { Core Java }

Can a constructor be private and how are this() and super() method used with constructor?

1023

Explain when we should make an instance variable private.

1148

How is java hashmap implemented?

1047

What is the purpose of file class?

1050

Is int a class in java?

991

Can we override protected method in java?

1080

Why singleton class is used in java?

1156

What is ascii format?

1004

What is the difference between public, private, protected, and friend access?

1065

Why parameters should be passed by reference?

984

What is the functionability stubs and skeletons?

1174

How thread scheduler schedule the task?

1078

Can we have try without catch block?

1107

What is the name of the java compiler?

1071

Why is the main method declared static?

1152

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