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

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Q71. Write code explaining use of Scanner class ?

Ans. Scanner sc = new Scanner(System.in);
int i = sc.nextInt();

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Q72. What is the difference between out.println(a+b); and out.println (a+" " +b); in Java? with a=2 and b=1

Core Java

Ans. First will give the ouput as 3 and the second will give output as 2 1

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Q73. 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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Q74. What are the fail safe systems ?

Operating System

Ans. Fail Safe systems are tolerant systems that continue processing even if they sense any problem. the objective here is to continue with the processing even if there are some problems instead of completely shutting it down. Example could be to catch an exception and still letting it complete with partial results.

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Q75. What are the advantages of using distributed database management system ?

Database

Ans. Reliability and Continuity if some of the sites goes down.Easy Scaling up and Down as sites can be added or removed without impacting business continuity.

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Frequently asked in face to face interviews.

Q76. 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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Q77. What is use of Revert in SVN?

Tools

Ans. Revert your local changes.

There are 2 types of reverts -

1) Local Revert: It will delete all changes from files which you made after updates and before commit.
2) Repo Revert: Upload the changes to previous Repo.

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Q78. What are the fail fast systems ?

Ans. Fail fast systems are intolerant systems that fails at the first instance of smelling any problem. The objective here is to break the system instead of continuing with the possibly flawed processing. Example could be breaking the processing upon an exception.

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Q79. What are the two main components of Hadoop System ?

BigData

Ans. Distributed file system and Map Reduce system.

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Q80. What is the use of Combiners ?

BigData

Ans. Combiners are used to increase the efficiency of a Map Reduce program. They are used to aggregate intermediate map output locally on individual mapper outputs. Combiners can help you reduce the amount of data that needs to be transferred across to the reducers.

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Frequently asked for Lead and Architect positions. Recently asked in many US companies.

Q81. What are Anti Patterns ?

Design

Ans. Anti-pattern is simply the creation of a pattern in your coding that negatively affects your code i.e the Negatives surpasses the positives.

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Q82. What are Node / Slaves in Jenkins ?

Jenkins

Ans. Slaves are computers that are set up to build projects for a master.

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Q83. Difference between System.out.printf and System.out.println ?

Core Java

Ans. println prints an additional end of line whereas printf doesnt.

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Q84. What is a shutdown hook ?

Core Java

Ans. Shutdown hook is a thread that is invoked implicitly by JVM just before the shut down. It is used to clean up unused resources.

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Q85. Which method of String class is used to convert Boolean to String ?

Core Java

Ans. toString() is an overloaded method of String class that is used to convert many data types to String, Boolean being one of them.

toString(Boolean bool)

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Q86. What is an exception and exception handling in Java ?

Core Java

Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected.

Exception handling is the mechanism which is used to handle such situations.

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Q87. Which environment variables do we need to set in order to run Java programs?

Core Java

Ans. PATH, CLASSPATH and JAVA_HOME

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Q88. Can an application have multiple main methods within different classes ? If yes, How will the app decide which one to be executed ?

Core Java

Ans. Yes we can have a main method with string[] argument in every class of an application. When we execute an app we specify the starting point i.e the class that will get the control first and hence main method of that class gets executed.

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Q89. 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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Q90. 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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Q91. why should one we use 32 bit system instead of 64 bit?

Operating System

Ans. Performance of a system doesn't solely rely on size of processor or it's communication size. It should also be compatible with other resources like memory, storage etc. Moreover it makes no sense to have 64 bit systems when there is hardly any software than can run on 64 bit system.

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Q92. Difference between Singleton and Factory Design Pattern ?

Design

Ans. Both are creational design patterns but singleton facilitates in creation and reuse of single object whereas Factory deals with creation of multiple objects.

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Q93. Describe Marketing subsystem and What WCS components are part of this system ?

IBM WCS

Ans. The Marketing subsystem is a component of the WebSphere Commerce Server, and provides numerous marketing concepts to your site, designed to increase brand awareness, and to attract and retain customers. Components of the marketing subsystem provide functionality to create marketing campaigns, including customer segments and advertising; and e-mail activities.

Various components are -

1. Promotions
2. Auctions
3. eSpots
4. e Mail Campaigns
5. Hubs and Extended sites for affiliates

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Q94. Describe Catalog subsystem and the tables used in WCS for managing this ?

IBM WCS

Ans. The catalog subsystem or Catalog Management provides online catalog navigation, partitioning, categorization, and associations. In addition, the catalog subsystem includes support for personalized interest lists and custom catalog display pages. The catalog subsystem contains all logic and data relevant to an online catalog, including catalog groups (or categories), catalog entries, and any associations or relationships among them.

Tables used for Catalog subsystem

1. CATENTRY
2. CATENTREL

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Q95. What are the core OOPs concepts ?

Core Java

Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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Q96. What is ACL ?

Operating System

Ans. Access Control List or ACL is the list of permissions attached to an object in the File System.

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Q97. Difference between Mutex and Semaphore?

Operating System

^{This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.}

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Q98. Explain process life cycle.

Operating System

^{This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.}

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Q99. What is an Operating system or OS ?

Operating System

^{This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.}

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Q100. What is thrashing?

Operating System

^{This question was recently asked at 'Veritas'.This question is still unanswered. Can you please provide an answer.}

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