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Interview Questions and Answers - Order By Newest

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 Q1201. Can a constructor throw an exception ?Core Java
Ans. Yes

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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q1202. Can constructor be synchronized in Java ?Core Java
Ans. No, constructors can not be synchronized in Java. In fact using the keyword synchronized with a constructor results in compilation error.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies      expert

 Q1203. Will finally run if we have return statement and it exits the method early ?Core Java
Ans. finally will execute in all graceful situations - graceful executions as well as graceful exceptions. The only situation when finally block won't execute is when the app is abruptly stopped, killed or unplugged.

  Sample Code for finally

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   Like         Discuss         Correct / Improve     finally      Intermediate

 Q1204. Is there any relationship between Web.xml and Spring.xml ?Spring
Ans. No, there is no relationship between web.xml and spring.xml but you have to configure spring.xml in web.xml in order initialize beans when application starts up

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   Like         Discuss         Correct / Improve     spring  web.xml  spring.xml  deployment descriptor     Asked in 1 Companies

 Q1205. Scale yourself on Java on the scale of 1 to 10General
Ans. [Open Ended Answer]

The objective of the question is to check how efficient one is in the language so that appropriate level questions are asked. Don't tell too high number if you are being interviewed for a junior or mid level position as the interviewer may throw advance level questions.

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   Like         Discuss         Correct / Improve          Asked in 17 Companies

 Q1206. Is it mandatory to have a default constructor ?Core Java
Ans. No.

Default constructor is provided by compiler if no constructor is provided ( argument or no argument ) by us.

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   Like         Discuss         Correct / Improve     constructor  default constructor     Asked in 1 Companies
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 Q1207. Which environment variables do we need to set in order to run Java programs?Core Java
Ans. PATH, CLASSPATH and JAVA_HOME

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   Like         Discuss         Correct / Improve     environment variables  path  classpath  java_home     Asked in 3 Companies      basic        frequent

 Q1208. Can an application have multiple main methods within different classes ? If yes, How will the app decide which one to be executed ?Core Java
Ans. Yes we can have a main method with string[] argument in every class of an application. When we execute an app we specify the starting point i.e the class that will get the control first and hence main method of that class gets executed.

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   Like         Discuss         Correct / Improve     main method     Asked in 3 Companies

 Q1209. Does importing a package imports all its sub packages too ?Core Java
Ans. No, but we can use wild card (*) to do so

For example -

import java.util.*

will import all packages with name starting with java.util

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   Like         Discuss         Correct / Improve     package   import packages     Asked in 1 Companies      basic

 Q1210. What is the default value of a declared object reference ?Core Java
Ans. Null

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   Like         Discuss         Correct / Improve     object reference  null     Asked in 1 Companies      basic

 Q1211. Is there a way to know size of an object in Java ?Core Java
Ans. No, Java doesn't have a sizeOf operator. In C / C++ , its required to determine how much memory allocation is required which is not the case with Java. Java handles memory allocation and deallocation intrinsically.

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   Like         Discuss         Correct / Improve     sizeOf  size of object  sizeOf operator     Asked in 1 Companies        rare

 Q1212. What are the different ways to handle an exception ?Core Java
Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception

2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it.

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   Like         Discuss         Correct / Improve     exception handling     Asked in 4 Companies
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 Q1213. How does Java handle integer overflows and underflows?Core Java
Ans. It uses those low order bytes of the result that can fit into the size of the type allowed by the operation.

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   Like         Discuss         Correct / Improve     integer  data types     Asked in 1 Companies        rare

 Q1214. Is delete a keyword in Java ?Core Java
Ans. No, delete is not a keyword in Java. Destruction of objects is taken care by Java Garbage Collection mechanism.

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   Like         Discuss         Correct / Improve     delete  keywords     Asked in 1 Companies

 Q1215. Is exit a keyword in Java ?Core Java
Ans. No exit is a method to exit execution of a program.

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   Like         Discuss         Correct / Improve     exit  keywords  exit a program     Asked in 1 Companies

 Q1216. Who invokes a thread's run method ?Core Java
Ans. After a thread is started using a call to start method, JVM invokes the thread’s run method when the thread is initially executed.

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   Like         Discuss         Correct / Improve     threads  thread run method     Asked in 1 Companies

 Q1217. What is nested interface?Core Java
Ans. Interface that is declared inside the interface or class, is known as nested interface. It is static by default.

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   Like         Discuss         Correct / Improve     interface  nested interface      intermediate
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 Q1218. What kind of thread is garbage collection thread ?Core Java
Ans. Daemon thread

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   Like         Discuss         Correct / Improve     garbage collection      intermediate
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 Q1219. What is the difference between the Reader/Writer java.io hierarchy and the Stream class hierarchy?Core Java
Ans. The Reader/Writer hierarchy is character oriented, whereas the Stream class hierarchy is byte oriented.

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   Like         Discuss         Correct / Improve     java io  streams      intermediate

 Q1220. What is an IO Filter ?Core Java
Ans. It's an object that reads from one stream and writes to another.

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   Like         Discuss         Correct / Improve     java io  io filter      intermediate

 Q1221. Difference between shallow copy and object cloning ?Core Java
Ans. Shallow copy is one of the way for object cloning, other being deep copy.

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   Like         Discuss         Correct / Improve     cloning  shallow copy  object cloning      basic

 Q1222. What is Shutdown hook ?Core Java
Ans. Shutdown hook is a thread that is invoked before the JVM is shut down. we can use it perform resource cleaning task.

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   Like         Discuss         Correct / Improve     shutdown hook  jvm
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 Q1223. Which interface is responsible for transaction management in JDBC ?Database
Ans. Connection Interface

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   Like         Discuss         Correct / Improve     jdbc

 Q1224. how to access the methods of an inner class?Core Java
Ans. It depends on the type of inner class

To access non static inner class method

new OuterClass().new InnerClass().getMethod();

To access static method of static inner class

new OuterClass.InnerClass().getMethod();

  Sample Code for inner class

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   Like         Discuss         Correct / Improve     inner classes  nested aclasses     Asked in 1 Companies      Intermediate        frequent

 Q1225. Which memory segment holds String Pool in Java ?Core Java
Ans. String Pool resides in runtime constant Pool which is a part of Heap memory segment.

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   Like         Discuss         Correct / Improve     string pool  memory management      Expert        rare

 Q1226. What are the cursors available in Java ?Core Java
Ans. Enumeration
Iterator
List iterator

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   Like         Discuss         Correct / Improve     cursors  iterator

 Q1227. Which Web and Application server is being used by your application ?Server
Ans. We are using Apache 2.3 and Tomcat 5.6

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   Like         Discuss         Correct / Improve     web server  application server  server      Basic        frequent

 Q1228. What are the steps you follow if you receive an application outage ticket ?Support
Ans. a. Inform the stake holders that the issue is being worked upon.
b. Login to server to see if its responding.
c. Access Application and Web Server logs to see if the application is receiving requests.
d. If not, Involve the appropriate Network Team.
e. Inform the stakeholders regarding the progress.
f. Bounce the web / application server instance , if required.
g. Close the ticket with the steps taken to resolve the problem.
h. Complete the RCA ( Root Cause Analysis ) and submit the report to stake holders.

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   Like         Discuss         Correct / Improve     production support

 Q1229. How do you monitor the server resources if inadvertently high traffic is reported ?Support
Ans. We use SAR command for that purpose. We also have GUI system monitoring tool to keep real time check of requests, load and memory usage.

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   Like         Discuss         Correct / Improve     production support  unix  SAR

 Q1230. How do you monitor your logs while investigating a high severity problem ?Support
Ans. We try to look for errors in the last n minutes when the issue occurred. If the issue is still occurring intermittently, We tail the logs for different application server instances to see the error snippets coming in the live logs.

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   Like         Discuss         Correct / Improve     production support  unix  application logs

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