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

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Q991. Can a lock be acquired on a class? How is it different than the object level lock ?

Ans. Yes, a lock can be acquired on the class. Class level lock is applicable on the whole class and hence on all objects of the class whereas the object level lock is applicable on the respective object.

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Q992. What is the use of Runtime Class ?

Ans. This class is used to provide access to the Java runtime system

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Frequently asked.

Q993. What should a class do if its implementing an interface ?

Core Java

Ans. It should either implement all interface methods or declare unimplemented methods as abstract.

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Q994. What should a class do if its extending an abstract class ?

Core Java

Ans. It should either implement the abstract methods or re-declare them abstract.

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Q995. What is a compilation unit in Java ?

Ans. Java Source Code File

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Q996. What is Associativity while evaluating a Java statement ?

Core Java

Ans. Associativity determines whether an expression is evaluated left-right or right-left. When an expression has two operators with the same precedence, the expression is evaluated according to its associativity.

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Q997. What are different types of variables in Java ?

Ans. 1. Function Local Variables
2. Instance Variables
3. Class variables or static variables

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Q998. Which of the following Java features facilitates Dependency Injection - Inheritance or Composition ?

Ans. Composition for sure. Inheritance in case the reference of a parent class is used. If its interface, no Inheritance involved.

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Q999. What are instance methods ?

Ans. All methods defined in a class that are not marked static are actually instance methods.

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Q1000. What is the difference between following time formats ?

hh:mm:ss
HH:mm:ss
kk:mm:ss
KK:mm:ss

Core Java

Ans. hh= hours in 1-12 format
HH= hours in 0-23 format
kk = Hours in 1-24 format
KK= hours in 0-11 format

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Q1001. What are the two main components of Hadoop System ?

BigData

Ans. Distributed file system and Map Reduce system.

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Q1002. 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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Q1003. What are the phases in Software Testing process ?

Process

Ans. Test Planning -> Test Design -> Test Execution -> Evaluating Exit Criteria and Closure

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Q1004. Write a java program to implement Quick sort ?

Core Java

Ans. http://www.programcreek.com/2012/11/quicksort-array-in-java/

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Frequently asked to Fresh graduates.

Q1005. Write a program to implement Binary search ?

Core Java

Ans. http://algs4.cs.princeton.edu/11model/BinarySearch.java.html

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Q1006. Which data structure would you recommend for ordered and sorted data?

Core Java

Ans. TreeSet and TreeMap are used for maintaining sorted elements.

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Q1007. Explain Exception Hierarchy in Java SE ?

Core Java

Ans. <a href="http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/" rel="nofollow">http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/</a>

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Q1008. What is a Database Procedure ?

Database

Ans. Stored procedures are a batch of SQL statements along with programming constructs ( if else, loops etc ) and stored as a single program that can be called by different clients and hence reused.

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Q1009. What is a Database sequence ?

Database

Ans. Its a feature wherein database creates unique values incremental values to be stored as primary key for the table.

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Q1010. What do you know about JQuery ?

Java EE

Ans. jQuery is a cross platform JavaScript library designed to simplify the client-side scripting of HTML. JQuery is the most popular JavaScript library.

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Q1011. Can we have try statement without catch? If try statement contains return will the finally block be executed? What happens if there is an exception inside finally block?

Core Java

Ans. Yes, with finally.

Yes, finally block will be executed even if there is no exception in try block.

If finally throws an exception, the exception gets thrown to the calling module.

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Very Frequently asked to fresh graduates and less experienced.

Q1012. What are the principle concepts of Object Oriented Programming ?

Core Java

Ans. Abstraction Polymorphism Inheritance Encapsulation

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Q1013. How to count total number of tables in database ?

Database

Ans. SELECT COUNT(*) FROM information_schema.tables

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Q1014. What is an IP address ?

Java EE

Ans. An Internet Protocol address is a numerical label assigned to each device participating in a computer network.

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Q1015. There is a Table Student having Student Id, Name and Total Marks. Can you please write an SQL that will display the maximum marks obtained by a student ?

Database

Ans. SELECT MARKS FROM STUDENT ORDER BY MARKS DESC LIMIT 1;

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Q1016. In case of a synchronized method, Does the method only gets locked or the whole object ?

Core Java

Ans. Just the method gets locked.

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Q1017. Can you assign value to a static final type at runtime ?

Core Java

Ans. No

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Q1018. Is it advisable to set the member variables through constructors instead of setting them through setters ?

Ans. Yes , If the values to be set are known at the time of initialization and doesn't involve polymorphic behavior.If it's using Dependency Injection , then Constructor injection must be available. If it suffice the above conditions, then definitely its advisable to have them set through constructor as they eagerly load the values into the memory and save it fro multiple values assignment ( one through default constructor and then through assignment )

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Q1019. What will happen if we have our own constructor but only initialize some of the member elements ?

Ans. Its always advisable to initialize all the member elements in case we don't use the compiler's default constructor as leftover member elements will have garbage values and may reflect and unstable state for the object.

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All these acronyms JDK,JRE,JVM etc are very frequently asked.

Q1020. Difference between JDK and JRE ?

Core Java

Ans. JRE or Java Runtime Environment is the Java Virtual Machine on which class files are executed. It includes borwser plugins that facilitates execution of class files in browsers.

JDK or Java Development Kit includes JRE , compiler and development tools.

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