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Interview Questions and Answers - Order By Newest

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 Q781. Can we compare Integers by using equals() in Java ?Core Java
Ans. Yes for the Wrapper class Integer but not for the primitive int.

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   Like         Discuss         Correct / Improve     java   wrapper classes   equals

Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions.
  Q782. What is rule regarding overriding equals and hashCode method ?Core Java
Ans. A Class must override the hashCode method if its overriding the equals method.

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   Like         Discuss         Correct / Improve     java   collections   hashcode  hash code   equals   collections     Asked in 44 Companies      intermediate        frequent
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 Q783. What is the difference between Collection and Collections ?Core Java
Ans. Collection is an interface whereas Collections is a utility class.

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   Like         Discuss         Correct / Improve     java   collections     Asked in 1 Companies

 Q784. Is Java a statically typed or dynamically typed language ?
Ans. Statically typed

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   Like         Discuss         Correct / Improve     java

 Q785. 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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 Q786. TreeMap orders the elements on which field ?
Ans. Keys

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   Like         Discuss         Correct / Improve     java   collections   map   treemap

 Q787. 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

 Q788. 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

 Q789. 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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   Like         Discuss         Correct / Improve     java   collections   treemap   comparable interface

  Q790. 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

 Q791. Can value be null in TreeMap ?Core Java
Ans. Yes.

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   Like         Discuss         Correct / Improve     java   collections   treemap   yes-no

 Q792. Which interface TreeMap implements ?
Ans. TreeMap implements NavigableMap, SortedMap, Serializable and Clonable.

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   Like         Discuss         Correct / Improve     java   collections   treemap

 Q793. 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.
 Q794. 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.
 Q795. 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

 Q796. 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

 Q797. 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

 Q798. 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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   Like         Discuss         Correct / Improve     hibernate   orm   hibernate cache   architecture

 Q799. What is Hibernate ?Hibernate
Ans. Hibernate is a Java ORM Framework.

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   Like         Discuss         Correct / Improve     hibernate   orm   frameworks   architecture

 Q800. 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

  Q801. 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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 Q802. 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

 Q803. 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

 Q804. 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

 Q805. 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

 Q806. 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

 Q807. Which class elements are not persisted ?Hibernate
Ans. Static and Transient.

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   Like         Discuss         Correct / Improve     hibernate   orm

 Q808. 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

 Q809. 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

 Q810. 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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   Like         Discuss         Correct / Improve     hibernate   hibernate configuration   hibernate.cfg.xml   hbm2ddl

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