Interview Questions and Answers for 'T' | Search Interview Question

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Q1261. What are the cursors available in Java ?

Core Java

Ans. Enumeration
Iterator
List iterator

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Q1262. 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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Q1263. Which is the highest level container which contains other widgets in SWT ?

SWT

Ans. Shell

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Q1264. Can we run Swing objects using SWT ?

SWT

Ans. Yes

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Q1265. 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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Q1266. 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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Q1267. How do we do event handling using SWT ?

SWT

Ans. We do it by registering listeners for respective widgets

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Q1268. 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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Q1269. 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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Q1270. 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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Q1271. 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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Q1272. 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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Q1273. 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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Q1274. 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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Q1275. 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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Q1276. 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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Q1277. What all caching has been used in your application?

Support

Ans. We are using Akamai as web server cache.

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Q1278. 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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Q1279. 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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Q1280. 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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Q1281. 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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Q1282. 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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Q1283. Do you feel that its useless to define hashCode method for a class ?

Core Java

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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Q1284. What is the difference between filter and filter-mappings xml tag within deployment descriptor ?

Java EE

Ans. filter tag speficies the filter name and respective class for handling filter action whereas filter mapping maps the filter to the url patterns ( specifying the url that needs to be intercepted )

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Q1285. Have you heard of SiteMesh ?

Java EE

Ans. Sitemesh is a web page layout and decoration framework by OpenSymphony. SiteMeshFilter can intercept the requests and then build UI components (based on configuration) then renders the final page.

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Q1286. What is a class and object ?

or

How would you explain a fresher the concept of class and object in simple terms ?

Core Java

Ans. Class is a template using which objects are created in memory. It's kind of a mold using which objects with body / state are made.

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Q1287. Explain dot(.) operator ?

Core Java

Ans. Its used to access the object properties using the object reference or class properties using the Class Name. Moreover its used to access the classes and Interfaces of a package.

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Q1288. How should we handle errors while writing or accessing Stored Procedures?

Database

Ans. Store Procedure returns the error code. Moreover we can put the call withing try block and catch SQL Exception.

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Q1289. Can we have only try block in java ?

Core Java

Ans. No, It should be followed by either catch or finally.

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Q1290. What is memory leak ? How Java helps countering memory leaks compared to C++ ?

Core Java

Ans. Memory Leak is a situation wherein we have a reserved memory location but the program has lost its reference and hence has no way to access it.

Java doesn't have concept of Pointers, Moreover Java has concept of Garbage collection that frees up space in heap that has lost its references.

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