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 Q1351. 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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 Q1352. 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

 Q1353. 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

 Q1354. Can we convert a numeric IP address to a web host name ?Java EE
Ans. Yes, using InetAddress.getByName("<IP Address>").getHostName();

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   Like         Discuss         Correct / Improve     ip address to hostname  INETAddress      intermediate

 Q1355. 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

 Q1356. 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
Try 1 Question(s) Test

 Q1357. Which interface is responsible for transaction management in JDBC ?Database
Ans. Connection Interface

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   Like         Discuss         Correct / Improve     jdbc

 Q1358. 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

 Q1359. 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

 Q1360. What are the cursors available in Java ?Core Java
Ans. Enumeration
Iterator
List iterator

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   Like         Discuss         Correct / Improve     cursors  iterator

 Q1361. 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

 Q1362. 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

 Q1363. 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

 Q1364. What all caching has been used in your application?Support
Ans. We are using Akamai as web server cache.

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   Like         Discuss         Correct / Improve     caching  production support

 Q1365. 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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   Like         Discuss         Correct / Improve     production support  caching

 Q1366. 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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   Like         Discuss         Correct / Improve     database  database server  production support

 Q1367. 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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   Like         Discuss         Correct / Improve     unix  command aliasis

 Q1368. 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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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q1369. How to use Find command in Unix ?Unix
Ans. http://javasearch.buggybread.com/UnixCommand/searchUnixCommandsScripts.php?keyword=find

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   Like         Discuss         Correct / Improve     find command     Asked in 1 Companies

 Q1370. 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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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q1371. 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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   Like         Discuss         Correct / Improve     hashcode  hash collections  search

 Q1372. 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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   Like         Discuss         Correct / Improve     deployment descriptor  web.xml  filters  filter mapping

 Q1373. 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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   Like         Discuss         Correct / Improve     sitemesh

 Q1374. 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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   Like         Discuss         Correct / Improve     class  object  class vs object     Asked in 4 Companies      basic        frequent

 Q1375. 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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   Like         Discuss         Correct / Improve     operators

 Q1376. 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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   Like         Discuss         Correct / Improve     stored procedure  exception handling

 Q1377. Does Java supports Default arguments ?Core Java
Ans. No

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 Q1378. 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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   Like         Discuss         Correct / Improve     try  exception handling

 Q1379. 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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   Like         Discuss         Correct / Improve     memory leak  garbage collection      intermediate        frequent

 Q1380. Write an algorithm / java program for Heap Sort ?Algorithm
Ans. https://www.geeksforgeeks.org/heap-sort/

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   Like         Discuss         Correct / Improve     sorting  heap sort     Asked in 1 Companies        frequent

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