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

Core Java Interview Questions

Questions Answers Views Company eMail

explain copyonwritearraylist and when do we use copyonwritearraylist?

963

What is serialization in java?

1076

What are alternatives to java serialization?

1139

Why to use nested classes in java? (Or) what is the purpose of nested class in java?

1086

Explain tree set and its features?

1076

Explain the importance of import keyword in java?

1020

Explain about arraylist?

1108

Difference between collection, collection and collections in java?

1021

Explain enumeration in java?

1018

What is classpath?

1035

List implementations of list interface?

1047

How to make a non daemon thread as daemon?

1075

Difference between comparator and comparable in java?

1110

What are thread local variables?

1163

What is vector?

1079

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Un-Answered Questions { Core Java }

Why object class is super class for every class in java?

1044

define polymorphism in java

1100

FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

3494

what is the use of bean managed and container managed with example?

1989

which one is more efficient int x; 1. if(x==null) 2.if(null==x) state which one either 1 or 2?

11249

What is final method in java?

1043

Why string is called as immutable?

968

Is double bigger than float?

1007

What are scriptlets?

1103

Hi.... I applied for the post of scientific officer/Engineer-SB(Programmer).Please post the syllabus and sample papers.

2010

Can a class extends itself in java?

1044

What are the pillars of java?

939

What are the object and class classes used for?

1057

How to create a custom exception?

1008

Realized?

2198

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