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 there a separate stack for each thread in java? : Java thread

989

what is the difference between thread and runnable types? : Java thread

1021

why not override thread to make a runnable? : Java thread

1018

can java object be locked down for exclusive use by a given thread? Or what happens when a thread cannot acquire a lock on an object? : Java thread

998

Explain different ways of creating a thread. Which one would you prefer and why?

1057

What are the differences between wait() and sleep()?

1032

What is the purpose of garbage collection in java? When is it used?

1064

What are the principle concepts of oops?

982

How does hashmap work in java ?

1071

What are the differences between string, stringbuffer and stringbuilder?

1048

What is an immutable object? How do you create one in java?

1082

How do you create immutable object in java?

1070

What are the uses of synchronized keyword?

1016

In java, what is the difference between method overloading and method overriding?

1138

What is the purpose of garbage collection in java?

1119

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Un-Answered Questions { Core Java }

Is hashset ordered java?

1104

How objects are stored in java?

1052

What is regex java?

1123

State one difference between a template class and class template.

1084

Can you call one constructor from another if a class has multiple constructors?

1055

Which oo concept is achieved by using overloading and overriding?

1031

what is interface in java? Explain

998

Is void a keyword in java?

1033

What is a numeric format?

1115

How do you sort words in java?

951

Who developed java?

1014

Which sorting algorithm is best in java?

1003

why using interface interface ?

2059

What is an class?

1054

What are the pillars of java?

939

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