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 Q781. How can we reverse the order in the TreeMap ?
Ans. Using Collections.reverseOrder()

Map tree = new TreeMap(Collections.reverseOrder());

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   Like         Discuss         Correct / Improve     java   collections   map   treemap
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 Q782. TreeMap orders the elements on which field ?
Ans. Keys

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   Like         Discuss         Correct / Improve     java   collections   map   treemap

 Q783. How TreeMap orders the elements if the Key is a String ?
Ans. As String implements Comparable, It refers to the String compareTo method to identify the order relationship among those elements.

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   Like         Discuss         Correct / Improve     java   collections   comparable interface   treemap   compareto

 Q784. Can we add heterogeneous elements into TreeMap ?
Ans. No, Sorted collections don't allow addition of heterogeneous elements as they are not comparable.

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   Like         Discuss         Correct / Improve     java   collections   comparable interface   treemap

 Q785. Will it create any problem if We add elements with key as user defined object into the TreeMap ?
Ans. It won't create any problem if the objects are comparable i.e we have that class implementing Comparable interface.

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  Q786. Can we have null keys in TreeMap ?Core Java
Ans. No, results in exception.

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   Like         Discuss         Correct / Improve     java   collections   treemap     Asked in 6 Companies      Basic        frequent

 Q787. Can value be null in TreeMap ?Core Java
Ans. Yes.

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   Like         Discuss         Correct / Improve     java   collections   treemap   yes-no

 Q788. Which interface TreeMap implements ?
Ans. TreeMap implements NavigableMap, SortedMap, Serializable and Clonable.

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 Q789. Do we have form beans in Struts 2 ?
Ans. No, because they are not longer required. As action classes are no more singleton in Struts 2, user inputs can be captured in action itself.

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   Like         Discuss         Correct / Improve     struts   struts2   struts 2

Frequently asked in Phone Interviews.
 Q790. What the Bean scopes provided by Spring ?Spring
Ans. Singleton , Prototype , Request , Session , global-session

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   Like         Discuss         Correct / Improve     spring framework   bean scope   general electric   ge

Frequently asked in Phone Interviews.
 Q791. What are the various Auto Wiring types in Spring ?
Ans. By Name , By Type and Constructor.

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   Like         Discuss         Correct / Improve     java   spring   spring container   dependency injection   auto wiring   auto wiring types   general electric   ge

 Q792. What are the the methods to clear cache in Hibernate ?Hibernate
Ans. Evict() and clear(). Evist is used to clear a particular object from the cache whereas clear clears the complete local cache.

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   Like         Discuss         Correct / Improve     hibernate   orm   hibernate cache

 Q793. What are different types of second level cache ?Hibernate
Ans. 1. EHCache ( Easy Hibernate )
2. OSCache ( Open Symphony )
3. Swarm Cache ( JBoss )
4. Tree Cache ( JBoss )

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   Like         Discuss         Correct / Improve     hibernate   orm   hibernate cache   technical lead     Asked in 7 Companies

 Q794. Can we disable first level cache ? What should one do if we don't want an object to be cached ?Hibernate
Ans. No.We can either call evict after the object retrieval or can use separate sessions.

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 Q795. What is Hibernate ?Hibernate
Ans. Hibernate is a Java ORM Framework.

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   Like         Discuss         Correct / Improve     hibernate   orm   frameworks   architecture

 Q796. What are the different types of inheritance in Hibernate ?Hibernate
Ans. Table Per Class , Table per Sub Class , Table per Concrete Class

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   Like         Discuss         Correct / Improve     hibernate   orm   inheritance hibernate     Asked in 1 Companies      Basic        frequent

  Q797. What is lazy fetching in Hibernate ?Hibernate
Ans. Lazy fetching is the technique of not loading the child objects when parent objects are loaded. By default Hibernate does not load child objects. One can specify whether to load them or not while doing the association.

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   Like         Discuss         Correct / Improve     hibernate   lazy fetching   architecture     Asked in 11 Companies        frequent
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 Q798. Different types of Hibernate Instance States ?Hibernate
Ans. Transient - In this state, an instance is not associated with any persistence context
Persistent - In this state, an instance is associated with a persistence context
Detached - This is a state for an instance which was previously associated with a persistence context an has been currently closed dissociated

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   Like         Discuss         Correct / Improve     hibernate

 Q799. Is It Good to use Reflection in an application ? Why ?Core Java
Ans. no, It's like challenging the design of application.

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   Like         Discuss         Correct / Improve     java   reflection api   yes-no   architecture     Asked in 1 Companies      intermediate

 Q800. Why is Reflection slower ?
Ans. Because it has to inspect the metadata in the bytecode instead of just using precompiled addresses and constants.

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   Like         Discuss         Correct / Improve     java   reflection   reflection api   architecture

 Q801. When should we use prototype scope and singleton scope for beans ?Spring
Ans. We should use singleton scope for beans when they are stateless and prototype when they are stateful.

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   Like         Discuss         Correct / Improve     spring   bean scope   general electric   ge  singleton

 Q802. Difference between Assert and Verify ?Testing
Ans. Assert works only if assertions ( -ea ) are enabled which is not required for Verify.Assert throws an exception and hence doesn't continue with the test if assert evaluates to false whereas it's not so with Verify.

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   Like         Discuss         Correct / Improve     assert   junit   mockito   verify   testing   unit testing     Asked in 5 Companies

 Q803. Which class elements are not persisted ?Hibernate
Ans. Static and Transient.

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   Like         Discuss         Correct / Improve     hibernate   orm

 Q804. What entries we make in the hibernate config file if we are not using hbm files but Annotations ?Hibernate
Ans. We configure Entity classes having annotated mappings.

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   Like         Discuss         Correct / Improve     hibernate   hibernate annotations

 Q805. How many SessionFactory and Session objects are created ?Java EE
Ans. Single SessionFactory object and multiple session objects for opening different session. Hibernate creates new Session object per thread.

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   Like         Discuss         Correct / Improve     hibernate   sessionfactory hibernate   session hibernate

 Q806. What is the use of hbm2ddl Configuration in Hibernate ?Hibernate
Ans. This configuration specifies if hibernate should creates the Schema / Table on its own if the respective table is not found.

"update" doesn't create the table if it's not found whereas configuration set as "create" creates the schema automatically.

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 Q807. What is the difference between these 2 annotations ?

@Entity

@Entity ( name="EMPLOYEES" )		Hibernate
Ans. The first annotation will try to map the Class with the Table as of same name as Class whereas the second annotation will specify the Entity name as "EMPLOYEES" and hence will try to map with Table Name "EMPLOYEES".

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 Q808. What is the difference between these 2 annotations ?

@Entity ( name ="EMPLOYEES")
@Entity @Table ( name=""EMPLOYEES"" )

@Entity ( name="EMP")
@Table ( name="EMPLPYEES" )		Hibernate
Ans. First Annotation will set the Entity name as EMPLOYEES and hence will try to map with the same Table name.

The second annotation will make the Entity mapped to table EMPLOYEES irrespective of the Entity Name ( which is class name in this case ).

Third Annotations will set the different names for Enitity and Table and will explicitly map them.

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 Q809. What are the different ID generating strategies using @GeneratedValue annotation ?Hibernate
Ans. Auto , Identity , Sequence and Table.

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 Q810. How to do Eager loading in Hibernate ?Hibernate
Ans. Using

lazy = false in hibernate config file

or

@Basic(fetch=FetchType.EAGER) at the mapping

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   Like         Discuss         Correct / Improve     hibernate   lazy loading hibernate   basic annotation hibernate   architecture

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