Interview Questions and Answers for 'C' | Search Interview Question

Interview Questions and Answers - Order By Rating

Usually asked to entry level software developers.

Q1711. Write a program to swap two variables without using third

Core Java

Ans. public static void main(String[] args) {
   int num1 = 1;
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve code coding Asked in 37 Companies basic frequent}

Q1712. Write an algorithm / Java Program to show duplicates in an array of n elements?

Algorithm

Ans. int duplicateArray[] = { 1, 2, 2, 3, 4, 5, 6, 8, 9}
Set unique = new HashSet();
for (int i = 0; i < duplicateArray.length; i) {
if (unique.contains(duplicateArray[i])) {
System.out.println(duplicateArray[i]);
} else {
unique.add(duplicateArray[i]);
}
}

Complexity O(n) = nHashSet contains and add has O(n) = 1

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve coding code Asked in 2 Companies}

Q1713. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve memory leak garbage collection intermediate frequent}

Q1714. Can we override wait() or notify() methods?

Core Java

Ans. wait and notify are declared final in object class and hence cannot be overridden.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve object class methods wait notify}

Q1715. Can we have only try block in java ?

Core Java

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve try exception handling}

Q1716. Does Java supports Default arguments ?

Core Java

Ans. No

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve}

Q1717. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve stored procedure exception handling}

Q1718. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve operators}

Q1719. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve class object class vs object Asked in 4 Companies basic frequent}

Q1720. 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 )

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve deployment descriptor web.xml filters filter mapping}

Q1721. What is a Servlet Filter ?

Java EE

Ans. It's an object that can intercept http request and response and hence we can take appropriate action on those requests.

There are different types of filters based on Specifications like

Authentication
Logging
Encryption
Tokenizing

etc

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve servlets servlet filters Asked in 3 Companies basic frequent}

Q1722. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve hashcode hash collections search}

Q1723. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Asked in 1 Companies}

Q1724. How to use Find command in Unix ?

Unix

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve find command Asked in 1 Companies}

Q1725. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve production support system support}

Q1726. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve unix command aliasis}

Q1727. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve database database server production support}

Q1728. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve production support caching}

Q1729. What all caching has been used in your application?

Support

Ans. We are using Akamai as web server cache.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve caching production support}

Q1730. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve production support system monitoring log monitoring}

Q1731. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve production support unix application logs}

Q1732. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve production support unix SAR}

Q1733. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve production support}

Q1734. Which Web and Application server is being used by your application ?

Server

Ans. We are using Apache 2.3 and Tomcat 5.6

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve web server application server server Basic frequent}

Q1735. What are the cursors available in Java ?

Core Java

Ans. Enumeration
Iterator
List iterator

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve cursors iterator}

Q1736. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve string pool memory management Expert rare}

Q1737. 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

Help us improve. Please let us know the company, where you were asked this question :

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

Q1738. Which interface is responsible for transaction management in JDBC ?

Database

Ans. Connection Interface

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve jdbc}

Q1739. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve shutdown hook jvm}

Try 1 Question(s) Test

Q1740. Difference between shallow copy and object cloning ?

Core Java

Ans. Shallow copy is one of the way for object cloning, other being deep copy.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve cloning shallow copy object cloning basic}

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.