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 15801

What do you mean by the term transient?

Ericsson,

5 11627

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

Ericsson,

5 14294

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 11478

How can you sort dates?

TCS,

2 9424

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

3 7278

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

Wipro,

1 4979

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

KPIT,

3 7620

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

KPIT,

5 9062

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 6980

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 3619

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

KPIT,

3 8962

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 14035

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 10969

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 11997

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Un-Answered Questions { Core Java }

What do you understand by java?

1052

How can we make copy of a java object?

1225

Is it necessary that each try block must be followed by a catch block?

1081

What methods are used in Servlet?Applet communication?

2315

Can we call virtual funciton in a constructor ?

2239

Define a java class.

1538

What are the java ide’s?

1100

What is the purpose of checked and unchecked exceptions in JAVA?

1078

What are exception handling keywords in java?

1104

What is join () in java?

1014

Can we override constructors?

1056

What are the 4 types of characters?

1066

How do weakhashmap works?

1208

Difference between stack and queue?

1143

Can a class extend 2 classes in java?

1098

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