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 it possible to write a regular expression to check if string is a number?

1039

What do you mean by aggregation?

1 1334

What are the wrapped, classes?

1063

What is the difference between iterator and enumeration ?

1016

Explain some best practices you would apply while using collection in java?

1047

What is the difference between hashmap and hashtable? What is an interface?

1173

What is starvation?

1333

From the two, which would be easier to write: synchronization code for ten threads or two threads?

1067

What is the difference between abstract classes and interfaces?

1038

What is the difference between dom and sax parser in java?

991

Describe what a thread-local variable is in java?

1030

What is busy spin, and why should you use it?

1096

What are the default and parameterized constructors?

1069

How do you take thread dump in java?

1023

Why java is not 100% object-oriented?

1 1524

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Un-Answered Questions { Core Java }

How do you clear an arraylist in java?

995

Differentiate between the constructors and methods in java?

959

How many bits is a 64 bit byte?

1093

What is the use of keywords in java?

991

Explain scope or life time of local variables in java?

1035

What are the core java topics?

1068

What is floor math?

1015

Can you extend singleton class?

1116

How do you square a number in java?

1067

What are mutable classes?

1069

Why array is used in java?

981

How do you override a variable in java?

1164

Can we overload the constructors?

1004

Hi friends am new to java. I read jar file means collection of java files. For executing struts application what are the necessary jar files. " struts.jar " file contains what. can u explain

1941

What is static variable with example?

1018

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