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Q2191. Do you feel that its useless to define hashCode method for a class ?

Ans. Yes its useless if we are not going to use its objects within Hash collection, For example - HashSet , HashMap. HashCode is used internally by these collections for Search.

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Q2192. How can be restrict creation of more than n objects in Java ?

Core Java

Ans. We can follow the same design which we follow in singleton Classes. We can have a static counter that will keep the count of number of objects already created, We can keep the constructor private and being called through the static method. We can keep incrementing the counter before calling the constructor and put a check to call only if it's lesser than n.

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Q2193. How to use Find command in Unix ?

Unix

Ans. http://javasearch.buggybread.com/UnixCommand/searchUnixCommandsScripts.php?keyword=find

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Q2194. How are DB transactions handled in Hibernate ?

Hibernate

Ans. // Non-managed environment idiom
Session sess = factory.openSession();
Transaction tx = null;
try {
tx = sess.beginTransaction();

// do some work
...

tx.commit();
}
catch (RuntimeException e) {
if (tx != null) tx.rollback();
throw e; // or display error message
}
finally {
sess.close();
}

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Q2195. What are your responsibilities after the problem ticket has been closed ?

Support

Ans. We inform the stakeholders regarding the resolution and steps taken for it. We updated the ticket notes and link it with the master / related tickets. RCA is done for the high priority and critical issues and a report is submitted.

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Q2196. Do you use command aliases while doing your work ?

General

Ans. Yes , I have created many aliases and saved them within my .profile file so that the system loads them, the each time i logs onto the server.

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Q2197. What actions you take if there is an issue related to Database server ?

Support

Ans. We involve DBA and try to solve it through them. By the time they are solving it , we keep the stake holders informed regarding the progress.

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Q2198. Have you ever faced any problem due to caching?

Support

Ans. Yes , sometime we receive issues related to outdated pages being rendered to the user. In those cases we clear the cache and then try to investigate the reason for that. Sometime the issue is due to comparatively high refresh interval. In those cases we reduce the cache refresh interval.

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Q2199. What all caching has been used in your application?

Support

Ans. We are using Akamai as web server cache.

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Q2200. Have you done any sort of automation in your system monitoring tasks ?

Support

Ans. Yes we have created System as well as Log monitoring scripts to keep track of exceptions. We are also using a tool that will inform the stake holders if an exceptional event occurs with the system.

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Q2201. 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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Q2202. 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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Q2203. 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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Q2204. 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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Q2205. If we need to change the cell text in tableviewer or tree viewer , which file should we make the change in ?

SWT

Ans. LabelProvider

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Q2206. Which class is used to create buttons and how many classes we have to create different button types ?

SWT

Ans. Only a single class ie Button is used to create all button types. We distinguish among different types by specifying the style while creating a new button object.

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Q2207. Have you worked with the TreeViewer ? If yes , explain

SWT

Ans. The TreeViewer class provides viewer support for displaying trees. This widget is used to display parent-child information with buttons to expand and collapse the tree.

We have to create and specify the LabelProvider and Content Provider classes. In the respective classes we specify the parent and child objects and their relationship.

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Q2208. Explain Layout Managers in SWT ?

SWT

Ans. A layout manager is responsible for arranging the user interface components of a container, e.g. a Composite, on the screen. SWT offers several standard layout managers.

Following are the layout managers offered by SWT

AbsoluteLayout
FillLayout
RowLayout
GridLayout
FormLayout

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Q2209. How do we do event handling using SWT ?

SWT

Ans. We do it by registering listeners for respective widgets

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Q2210. Are SWT Widgets automatically Gabage collected ?

SWT

Ans. SWT widgets are not automatically garbage collected. If you release an SWT widget, you have to call its dispose() method.

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Q2211. What are the key components of SWT applications ?

SWT

Ans. The Display and Shell classes are key components of SWT applications.

A org.eclipse.swt.widgets.Shell class represents a window.

The org.eclipse.swt.widgets.Display class is responsible for managing event loops, fonts, colors and for controlling the communication between the UI thread and other threads. Display is the base for all SWT capabilities.

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Q2212. Can we run Swing objects using SWT ?

SWT

Ans. Yes

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Q2213. Which is the highest level container which contains other widgets in SWT ?

SWT

Ans. Shell

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Q2214. What is SWT ?

SWT

Ans. SWT is an open source widget tool kit for developing rich, efficient and portable GUI applications.

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Q2215. What are the cursors available in Java ?

Core Java

Ans. Enumeration
Iterator
List iterator

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Q2216. 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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Q2217. 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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Q2218. Which interface is responsible for transaction management in JDBC ?

Database

Ans. Connection Interface

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Q2219. 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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Q2220. 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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