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

985

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

1012

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

1011

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

992

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

1043

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

1021

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

1052

What are the principle concepts of oops?

966

How does hashmap work in java ?

1064

What are the differences between string, stringbuffer and stringbuilder?

1040

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

1073

How do you create immutable object in java?

1058

What are the uses of synchronized keyword?

1004

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

1129

What is the purpose of garbage collection in java?

1105

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Un-Answered Questions { Core Java }

Where are register variables stored?

1020

How does finally block differ from finalize() method?

1055

What is the purpose of the enableevents() method?

1050

What is boolean query?

992

What are the differences between c++ and java?

1144

Differentiate between == and equals().

1055

How to check if a list is sorted in java?

1039

What will happen if a thrown exception is not handled?

1026

When we serialize an object does the serialization mechanism saves its references too?

1022

Is a class subclass of itself?

1091

Why array is used in java?

978

Can a class be protected in java?

979

What are different data structures in java?

1054

Is the milky way in a void?

968

What is unicode with example?

1223

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