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 Q701. Will this code Work ? If not , Why ?

java.util.Calendar c = new java.util.Calendar();		Core Java
Ans. No. It gives the error "Cannot Instantiate the type Calendar". Calendar is an abstract class and hence Calendar object should be instantiated using Calendar.getInstance().

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   Like         Discuss         Correct / Improve     java   date   calendar   abstract class   yes-no

 Q702. Is java.util.Date an abstract Class ? Is java.util.Calendar an abstract Class ?Core Java
Ans. Date is not a abstract class whereas Calendar is.

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   Like         Discuss         Correct / Improve     java   date   calendar   abstract class

 Q703. What will the following code print ?

java.util.Calendar c = java.util.Calendar.getInstance();
c.add(Calendar.MONTH, 5);
System.out.println(c.getTime());		Core Java
Ans. Date and Time after 5 months from now.

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   Like         Discuss         Correct / Improve     java   date   calendar   scjp   ocjp   coding   code

 Q704. Which of the following code is correct ?

a. DateFormat df = DateFormat.getInstance();
b. DateFormat df = DateFormat.getDateInstance();
c. DateFormat df = DateFormat.getInstance(DateFormat.FULL);
d. DateFormat df = DateFormat.getDateInstance(DateFormat.FULL);		Core Java
Ans. All except c are correct.

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   Like         Discuss         Correct / Improve     java   date   dateformat

 Q705. What is the use of parse method in DateFormat ?
Ans. It is used to parse String to get the Date Object with initialized date.

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   Like         Discuss         Correct / Improve     java   date   dateformat

 Q706. Which of the following is not a valid java.util.Locale initialization ?

a. new Locale ()
b. new Locale ( String language )
c. new Locale ( String language , String country )		Core Java
Ans. a i.e new Locale()

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   Like         Discuss         Correct / Improve     java   locale   java.util

 Q707. Which of the following is not a valid NumberFormat initialization ?

a. NumberFormat.getInstance()
b. NumberFormat.getDateInstance()
c. NumberFormat.getCurrencyInstance()
d. NumberFormat.getNumberInstance()		Core Java
Ans. b i.e NumberFormat.getDateInstance()

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 Q708. What will the following code print ?

public static void main(String[] args){
Integer i1 = new Integer("1");
Integer i2 = new Integer("2");
Integer i3 = Integer.valueOf("3");
int i4 = i1 + i2 + i3;
System.out.println(i4);
}		Core Java
Ans. 6

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 Q709. Which of the following syntax are correct ?a. LinkedList<Integer> l=new LinkedList<int>();b. List<Integer> l=new LinkedList<int>();c. LinkedList<Integer> l=new LinkedList<Integer>();d. List<Integer> l = new LinkedList<Integer>();Core Java
Ans. All are correct.

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   Like         Discuss         Correct / Improve     java   generics   linkedlist   list   collections      basic

 Q710. Which of the following code is correct ?

a. Date date = DateFormat.newInstance(DateFormat.LONG, Locale.US).parse(str);

b. Date date = DateFormat.newInstance(DateFormat.LONG, Locale.US).format(str);

c. Date date = DateFormat.getDateInstance(DateFormat.LONG, Locale.US).parse(str);		Core Java
Ans. c

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 Q711. Which methods of the Pattern class have equivalent methods in the String class? Core Java
Ans. split() and macthes()

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   Like         Discuss         Correct / Improve     java   io   string class   string   pattern

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.
  Q712. 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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 Q713. 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

 Q714. How can we reverse the order in the TreeMap ?
Ans. Using Collections.reverseOrder()

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

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 Q715. TreeMap orders the elements on which field ?
Ans. Keys

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 Q716. 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

 Q717. 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

 Q718. 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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  Q719. 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

 Q720. Can value be null in TreeMap ?Core Java
Ans. Yes.

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 Q721. Which interface TreeMap implements ?
Ans. TreeMap implements NavigableMap, SortedMap, Serializable and Clonable.

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 Q722. 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.
 Q723. 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.
 Q724. 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

 Q725. 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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 Q726. 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

 Q727. 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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 Q728. What is Hibernate ?Hibernate
Ans. Hibernate is a Java ORM Framework.

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 Q729. 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

  Q730. 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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