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| Interview Questions and Answers - Order By Newest | ||||
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| Ans. 1. EHCache ( Easy Hibernate ) 2. OSCache ( Open Symphony ) 3. Swarm Cache ( JBoss ) 4. Tree Cache ( JBoss ) | ||||
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 Discuss Correct / Improve  hibernate orm hibernate cache technical lead  Asked in 7 Companies | ||||
 Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback) | ||||
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| Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html | ||||
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Discuss Correct / Improve java design pattern singleton at&t ebay fidelity india united healthcare india Asked in 46 Companies  intermediate  frequent | ||||
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| 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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| Discuss Correct / Improve hibernate hibernate criteria Asked in 7 Companies Basic Frequent | ||||
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| 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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| Discuss Correct / Improve sdlc agile methodology software system analyst software developer interview development lead project lead interview Asked in 14 Companies frequent | ||||
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| 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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| Discuss Correct / Improve system analyst software system analyst software business analyst Asked in 4 Companies frequent | ||||
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| 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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| Discuss Correct / Improve architecture production support java servers application support Asked in 7 Companies frequent | ||||
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| 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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| Discuss Correct / Improve fail safe systems system design exception handling Asked in 3 Companies | ||||
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| Ans. [Open Ended Answer] | ||||
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| Discuss Correct / Improve elsevier open ended questions overstock.com cerner Asked in 15 Companies frequent | ||||
| Must know at all levels. Among Top 10 frequently asked questions in Java. Very frequently asked to fresh graduates or less experienced professionals. | ||||
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| Ans. Its a facility for code reuse and independent extension wherein a derived class inherits the properties of parent class. | ||||
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| Discuss Correct / Improve inheritance object oriented programming (oops) oops concepts oops concepts java concepts code reuse code re-use classes derived classes Asked in 14 Companies basic frequent | ||||
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| Ans. Destructor is used to de-allocate memory allocated by objects. There are no destructors in Java. Alternatively, Java provides Automatic garbage collection i.e automatically releasing the un-referenced memory. | ||||
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| Discuss Correct / Improve destructor garbage collection Asked in 11 Companies Basic frequent | ||||
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| 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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| Discuss Correct / Improve exception hierarchy exceptions Asked in 3 Companies | ||||
| Frequently asked question in companies using Rest Web services. | ||||
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| Ans. PUT requests are only meant to place the object as it is on server. For example - You want a file to be uploaded and then placed in a particular folder or you want an Employee object to be persisted in the table. POST requests are also meant to transfer information from client to server but that information once received at the server is evaluated , modified or refactored before persisting. | ||||
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| Discuss Correct / Improve Put vs Post Rest Asked in 5 Companies frequent | ||||
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| Ans. Enums in Java are used to declare predefined objects and then reuse them. they offer many benefits 1. Enum instance are type safe and thread safe. 2. Enum instances are singleton and hence reused. 3. If we use Enums with Switch , It makes sure that the passed argument is either of its instance and hence provides a safeguard. 4. If we use Enum with Sorted Collections we can sort the elements with a predefined priorities ( as per constant declaration in enum ) 5. We can use Enum as a Factory by defining its constructor. 6. We can store related constant data within enum. For example - If we know the values for the map upfront, we can alternatively use an enum. | ||||
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| Discuss Correct / Improve Asked in 6 Companies | ||||
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| Ans. We can use external table feature of Oracle. | ||||
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| Discuss Correct / Improve Asked in 1 Companies Intermediate | ||||
| Frequently asked Design Pattern interview question. | ||||
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| Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects. | ||||
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| Discuss Correct / Improve design pattern prototype design pattern cloning Asked in 11 Companies intermediate | ||||
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| Ans. <a href="http://javahungry.blogspot.com/2015/03/difference-between-array-and-arraylist-in-java-example.html" rel="nofollow">http://javahungry.blogspot.com/2015/03/difference-between-array-and-arraylist-in-java-example.html</a> | ||||
 Sample Code for ArrayList | ||||
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| Discuss Correct / Improve array arraylist Asked in 11 Companies basic frequent | ||||
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| Ans. 59 23 28-31 * * [ "$(date +%d -d tomorrow)" = "01" ] && job_name | ||||
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| Discuss Correct / Improve unix crontab Asked in 1 Companies | ||||
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| Ans. du -a /var | sort -n -r | head -n 10 | ||||
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| Discuss Correct / Improve unix command Asked in 1 Companies | ||||
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| Ans. PID - process identification number is an identification number that is automatically assigned to each process when it is created USER - User Name PR - PR is the process actual priority NI is the nice value, which is a user-space concept. VIRT -Virtual Image (kb). The total amount of virtual memory used by the task. RES - Resident size (kb). The non-swapped physical memory a task has used. SHR - Shared Mem size (kb). The amount of shared memory used by a task. S - Process Status. The status of the task which can be one of: D = uninterruptible sleep R = running S = sleeping T = traced or stopped Z = zombie %CPU - % CPU usage %MEM - % MEM Usage TIME - Total CPU time the task has used since it started. COMMAND - Command which was used to execute the process | ||||
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| Discuss Correct / Improve top command unix command Asked in 1 Companies | ||||
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| 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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| Discuss Correct / Improve exception handling Asked in 18 Companies basic frequent | ||||
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| Ans. [Open Ended Answer] The objective of the question is to check how efficient one is in the language so that appropriate level questions are asked. Don't tell too high number if you are being interviewed for a junior or mid level position as the interviewer may throw advance level questions. | ||||
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| Discuss Correct / Improve Asked in 17 Companies | ||||
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| Ans. PATH, CLASSPATH and JAVA_HOME | ||||
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| Discuss Correct / Improve environment variables path classpath java_home Asked in 3 Companies basic frequent | ||||
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| 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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| Discuss Correct / Improve main method Asked in 3 Companies | ||||
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| Ans. No, but we can use wild card (*) to do so For example - import java.util.* will import all packages with name starting with java.util | ||||
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| Discuss Correct / Improve package import packages Asked in 1 Companies basic | ||||
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| Ans. Null | ||||
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| Discuss Correct / Improve object reference null Asked in 1 Companies basic | ||||
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| Ans. No, Java doesn't have a sizeOf operator. In C / C++ , its required to determine how much memory allocation is required which is not the case with Java. Java handles memory allocation and deallocation intrinsically. | ||||
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| Discuss Correct / Improve sizeOf size of object sizeOf operator Asked in 1 Companies rare | ||||
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| Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception 2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it. | ||||
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| Discuss Correct / Improve exception handling Asked in 4 Companies | ||||
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| Ans. It uses those low order bytes of the result that can fit into the size of the type allowed by the operation. | ||||
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| Discuss Correct / Improve integer data types Asked in 1 Companies rare | ||||
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| Ans. No, delete is not a keyword in Java. Destruction of objects is taken care by Java Garbage Collection mechanism. | ||||
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| Discuss Correct / Improve delete keywords Asked in 1 Companies | ||||
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| Ans. No exit is a method to exit execution of a program. | ||||
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| Discuss Correct / Improve exit keywords exit a program Asked in 1 Companies | ||||
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Which of the following Design pattern has been used with Hibernate Criteria ?
