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Rarely asked as it was introduced with Java 8.

Q1021. Difference between DoubleSummaryStatistics , IntSummaryStatistics and LongSummaryStatistics ?

Ans. They all does the same task i.e to compute statistical information on the stream of data. They differ by the way they store the statistical information as they expect a different data type of the values being used.

IntSummaryStatistics and LongSummaryStatistics expect non floating point values and hence stores the statistical information like min,max and sum as non floating values ( int or long ) whereas DoubleSummaryStatistics stores these information as floating value.

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Q1022. What is CopyOnWriteArrayList ?

Ans. Its a type of ArrayList in which all Write operations , i.e add and set are performed by creating a new copy. This array never changes during the lifetime of the iterator, so it never throws ConcurrentModificationException

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Q1023. What are the advantages and disadvantages of CopyOnWriteArrayList ?

Core Java

Ans. This collections class has been implemented in such a manner that it can never throw ConcurrentModificationException. As it performs update and write operations by creating a new copy of ArrayList, It's slower compared to ArrayList.

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Q1024. What is ConcurrentModificationException ?

Core Java

Ans. This is the exception that is thrown when we try to modify the non concurrent collection class while iterating through it.

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Q1025. What is Criteria in Hibernate ?

Hibernate

Ans. Criteria is a simplified API for retrieving entities by composing Criterion objects.

For example - session.createCriteria(Employee.class).add( Restrictions.like("name", "A%") ).list();

will return all employee objects having name starting with A.

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Try 1 Question(s) Test

Q1026. How do we specify the criteria if it involves mapping between two entities or join between tables ?

Hibernate

Ans. The following code returns the list of Employee objects having employee name starting with A and Dept Name ( Department , Employee Mapped ).

session.createCriteria(Employee.class,"emp")
.createAlias("emp.department", "dept",Criteria.INNER_JOIN)
.add( Restrictions.like("name", "A%") )
.add(Restrictions.eq("dept.name","Finance")
.list();

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Q1027. Name few Restriction Methods ?

Hibernate

Ans. eq, ge, gt , between, in , isNull, isEmpty, isNotnull, ne , like, lt , or , not

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Q1028. In Hibernate, While defining Criteria, Have you ever faced any problem while adding restrictions with user defined types or Enums ?

Hibernate

Ans. Yes, with Enum as was getting an exception while doing equality check for enum field.

got it fixed by adding @Enumerated(EnumType.STRING) to the field in entity.

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Q1029. What is your choice while writing queries within Hibernate - criteria or HQL ?

Hibernate

Ans. I prefer using Criteria for Dynamic queries and HQL for static queries.

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Q1030. Can we initialize member variables within static block ?

Ans. Static block is like static method that gets executed upon class loading. The way static method allows accessing member variables ( using object references only ), the same static block can also access and initialize member variables.

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Q1031. Which Software Development methodology is being used in your current Job ?

General

Ans. We are using Agile methodology. I attend daily stand up where the development leads takes the status of assigned stories, achievements, any bottlenecks or challenges. We follow iteration of 2 weeks.

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Q1032. What is your role in current position ?

General

Ans. I am working as a Software System Analyst that specializes in understanding Business Requirements, Analyzing them , Performs Cost / Benefit analysis, Make suggestions to business , translate the business requirements into technical requirements, Discuss their feasibility with the technical team, performs sizing in coordination with developers and prepare high level design document.

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Q1033. Which version control system you are using in your current project ?

Tools

Ans. We are using SVN and Git Hub.

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Q1034. What is the use of @GeneratedValue annotation in Hibernate?

Hibernate

Ans. This annotation is added to the auto increment column with the strategy to increment the column value. Usually this is added to the surrogate primary key column and specified with the Database Sequence.

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Q1035. Name few classes that extends Number Class ?

Ans. http://www.buggybread.com/2015/02/java-util-classes-that-inherit-number.html

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Q1036. Name few Date and Time Classes you have used in your projects ?

Ans. http://www.buggybread.com/2015/02/java-util-date-time-classes-and.html

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Q1037. Name few Locale classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-locale-classes-and-interfaces.html

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Q1038. Name few annotations related classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-annotations-classes-and-interfaces.html

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Q1039. Name few Boolean classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-data-types-double-classes-and_31.html

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Q1040. Name few Double data types related classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-data-types-double-classes-and.html

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Q1041. Name few float data type related classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-data-types-float-classes-and.html

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Q1042. Name few Integer related classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-data-types-integer-classes-and.html

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Q1043. Name few long data type related classes and interfaces ?

Ans. http://www.buggybread.com/2015/01/java-data-types-long-classes-and.html

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Q1044. What are few iterator classes provided by Java ?

Ans. http://www.buggybread.com/2015/01/java-iterator-classes-and-interfaces.html

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Q1045. What is the difference betweeen @Inject and @Autowired ?

Spring

Ans. @Autowired and @Inject are similar in terms of functionality they achieve. @Inject is part of a new Java technology called CDI that defines a standard for dependency injection whereas @Autowired is a Spring specific annotation for dependency injection.

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Q1046. What is Jenkins ?

Jenkins

Ans. It is a continuous integration tool written in Java.

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Q1047. Do you know the way to remove unused imports automatically in eclipse ?

Eclipse

Ans. Select the package -> Right Click -> Source -> Organize Imports.

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Q1048. What is Nagios ?

Ans. Nagios is open source system , network and infrastructure monitoring software application. It alerts the user if anything goes wrong. Nagios is widely used as monitoring tool for enterprise applications.

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Frequently asked in Tata Consultancy (TCS) interview ( Based on 2 Feedback )

Q1049. What are the technologies used in Jira ?

Tools

Ans. JIRA is written in Java and uses the Pico IOC container,Apache OFBiz entity engine, and WebWork technology stack. For remote procedure calls (RPC), JIRA supports REST, SOAP, and XML RPC.

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Q1050. What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?

Object Oriented Programming

Ans. Stateless objects are the objects without instance fields (instance variables). The class may have compile time constants i.e static final fields.Immutable objects are the objects which have state but the state cannot be changed after initialization. Both are Thread safe.

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