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

Core Java Interview Questions

Questions Answers Views Company eMail

What is a constructor, constructor overloading in java?

1007

When is the finalize() called?

1199

What is difference between fail-fast and fail-safe?

1257

When does an object becomes eligible for garbage collection in java?

1085

What is the difference between serial and throughput garbage collector?

1118

What does the “static” keyword mean?

1119

What is the difference between jdk and jre?

1080

What’s a deadlock?

1119

How hashmap works in java?

1063

What are pass by reference and pass by value?

1006

what is comparable and comparator interface?

1004

Explain the available thread states in a high-level?

987

How does finally block differ from finalize() method?

1070

What is jvm? Why is java called the platform independent programming language?

1040

What are the two types of exceptions in java? Which are the differences between them?

1112

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Un-Answered Questions { Core Java }

What is a finally block?

998

Why java strings are immutable in nature?

1086

Write a program to find the greatest of three numbers in java?

1021

What modifiers may be used with an inner class that is a member of an outer class in java programming?

1120

How an object is serialized in java?

1002

Why java is call by value?

1044

Why should we use singleton pattern instead of static class?

947

What is broken and continue statement?

1016

What is the benefit of lambda expressions?

1086

Why do we need strings in java?

1009

What is a java list?

1128

What is the use of inner class?

1061

Explain the public class modifier?

970

How do you reverse a string in java?

1160

Do you need to import math in java?

1024

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