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

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Q2551. In Spring , Which class handles the Http requests for RESTful web services ?

a. Service
b. Model
c. Controller
d. Util

Spring

Ans. Controller

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Q2552. Which is the Parent Class of CertStoreParameters class?

Ans. Clonable

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Q2553. What is RI or Reference Implementation ?

Ans. RI or Reference Implementation is a sample implementation provided for the API's / Specs, usually by their developers. This is usually a part of API documentation.

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Q2554. Are Servlet classes Thread Safe ?

Java EE

Ans. No

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Q2555. Develop a simple paint like program using applets ?

Ans. Follow the below steps:

1- import the required class and packages.
2- create a class Drawtest for creating an applet.
3- initialize panles and controls int the init() method.
4- Define the destroy() method to destroy the same.
5- create an instance for draw test class and call the init(0 and start() methods in the main method)).
6- Add a new frame to the applet window and resize it to 300x300.
7- Declare a method get applet infor to display the applet information.
8- Declare two constants LINES , POINTS which are going to be the modes.
9- Define the paint method and perfoem the required operations.
10- Display the result according to the mode selected.

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Q2556. Explain Application / Server architecture being used in your project ?

or

Explain your project architecture ?

Ans. We are using cluster of Web servers and Application servers. Load Balancer is used to manage the load between them. Down the layer we have middleware server and then DB server to access database.

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Q2557. How do you monitor the server resources if inadvertently high traffic is reported ?

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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Q2558. Have you ever faced any problem due to caching?

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 Yes , sometime we receive issues related to outdated pages being rendered to the user.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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Q2559. What is GregorianCalendar class ?

Ans. This class provides support for traditional Western calendars.

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Q2560. Difference between prefix and postfix increment operator ?

Ans. Prefix operator performs the increment and then assignment whereas its inverse for postfix operator.

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Q2561. Difference between parameters and arguments ?

Core Java

Ans. Parameters are the variables that the method is expected to receive along with the method call. Arguments are the values which are passed on while calling the methods.

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Q2562. Print natural numbers sequentially with two threads.

Core Java

Ans. http://stackoverflow.com/questions/18799591/print-natural-sequence-with-help-of-2-threads1-is-printing-even-and-2nd-is-pri

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Q2563. Which java frameworks have you used ?

General

Ans. I have primarily worked on Web applications and hence worked on Struts , Spring , Hibernate, JSF ( Java Server Faces ) , Velocity etc.

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Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )

Q2564. What is Dependency Injection or IOC ( Inversion of Control ) ?

Design

Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility.

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Q2565. Explain the challenging problems you faced recently and how you overcame it ?

General

Ans. [Open Ended Answer]

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Q2566. Explain TDD or Test Driven Design ?

Design

Ans. TDD is a development process that involves short iterations: first an automated test case is written. Then, the code is written to pass that test, and finally one refactors the new code to acceptable standards.

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Frequently asked in face to face interviews.

Q2567. Write a program to print fibonacci series.

Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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Q2568. How are values passed in Java ? By value or reference ?

Core Java

Ans. Java only provides pass by value.

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Q2569. Can we add more elements to an array list that has been marked as final ?

Ans. Yes, the array list can hold more elements. Final only puts the restriction that the array list reference cannot hold any other array list.

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Q2570. Which Data Structure should be used for Load Balancer ?

Ans. [ Open Ended question ]

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Q2571. What is the use of Synchronized block ?

Core Java

Ans. The goal of a synchronised block is to achieve mutual exclusion i.e at one time, the segment of the code should be executed by single thread only and hence the lock needs to be retrieved before executing the segment and then released.

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Q2572. What is continuous integration ?

Process

Ans. Continuous integration or CI is the practice, of merging all developer working copies to a shared mainline several times a day.

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Must know at all levels. Among Top 10 frequently asked questions in Java. Very frequently asked to fresh graduates or less experienced professionals.

Q2573. What is Inheritance ?

Core Java

Ans. Its a facility for code reuse and independent extension wherein a derived class inherits the properties of parent class.

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Q2574. What is a Java Bean ? How is it different from other Java classes ?

Ans. A Java bean is a class which abides by following conventions:

Core of the object is member elements and not operations ( methods )

Member Elements can be accessed by getters (and setters if those properties are not read-only).

serializable.

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Q2575. What is ADT or Abtstract Data Type ?

Core Java

Ans. ADT is a container which holds different types of objects with specifications.

For example - Stack, Array, Liked list, Tree

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Q2576. Find the repeating number using O(n) time and constant space.

Algorithm

Ans. http://www.geeksforgeeks.org/find-duplicates-in-on-time-and-constant-extra-space/

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Q2577. Write a method to convert all elements of a set to lower case.

Core Java

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=Method+to+convert+all+elements+of+a+collection&category=code

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Q2578. Write java code to Get all words from a String and display them

Core Java

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=+Get+all+words+from+a+String&category=code

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Recently asked in Sophos

Q2579. Write a Method to get a map of words and their count by passing in the string

Core Java

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=Method+to+get+a+map+of+words&category=code

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_{Like Discuss Correct / Improve map collections Asked in 2 Companies intermediate}

Q2580. Write code for singleton class

Design

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=singleton+class&category=code

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