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

Core Java Interview Questions

Questions Answers Views Company eMail

Can we instantiate Interfaces?

Ericsson,

7 15476

What do you mean by the term transient?

Ericsson,

5 11419

What are the two ways you can synchronize a block of code?

Ericsson,

5 14082

Package1 and Package2 both have a method name lets say "methodA" with different implementation. When I import both the packages in a java class how can I use both the methods?

Ericsson,

7 11248

How can you sort dates?

TCS,

2 9307

Why to give the file name same as the public class name in java?

3 7129

Is there any use of an abstract class which has no methods and no attributes?

Wipro,

1 4896

If your team member writes code with lots of static variables and static methods, will it cause any side effects?

KPIT,

3 7498

If I have 1000 objects and my requirement is to sort them quickly, then which collection would you recommend and why?

KPIT,

5 8856

I have a Person object with 5 variables and I want to store them in a file called Person.txt. What should I do?

KPIT,

3 6857

There is a Banking application. It has 2 types of account, Savings and Current. Write a method calculateInterest by passing an ArrayList of these account objects and calculate Interest accordingly. Write code for this situation

ABC, KPIT,

1 3532

If two threads call a static method at the same point of time, what will happen?

KPIT,

3 8836

There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it?

KPIT,

9 13718

There are 2 classes, 1 LandAnimal and another WaterAnimal. There is another class Animal which wants to have the properties of both LandAnimal and WaterAnimal. How will you design this situation?

KPIT,

6 10745

I have a String s = java; What is the output when I say s.replaceAll('j', 'k'); Also what is the value of s after replacing?

KPIT,

8 11707

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Un-Answered Questions { Core Java }

Can we create object of static class?

1025

give an example for encapsulation?

1047

Is set sorted in java?

933

Explain the difference between collection api and stream api in java8?

974

Explain a situation where finally block will not be executed?

1041

How do you detect memory leaks?

1058

What is pangram in java?

1012

What is object data type?

997

What are the concepts of 'OOPS'?

1074

Can variables be used in java without initialization?

1081

How many types of variables are there?

1130

What is a line separator in java?

980

What is qualitative variable?

928

Why is core java important?

1041

What is a method declaration?

994

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