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Monday, 21 January 2013

What are methods available in|for Collection interface in java|6 example|api|program

Collection interface in java Collection interface in java 6 Collection interface in java example Collection interface api Collection interface methods in java Collection interface methods Collection interface api java
what are methods available in Collection interface Collection interface examples in java Collection interface example program example program for Collection interface in java

Collection Interface :

                 Collection is one of the predefined interface on the top of all 1D collection frame 
     interfaces. An object of collection interface allows duplicate elements. It allows us to add 
     the data only at end but not at the specific position. Object of collection allows us to display  
     the data in random order and it allows to retrieve the data only in forward but not in backward 

Profile Of Java.util.collection :
      1)      Public int size() :
          This method is used for finding the number of elements present in any collection frame 
        work variable.
      2)      Public Boolean isEmpty():
        This method returns true provided collection frame work variable does not contain any 
       element (Empty).
        This method returns false provided collection frame work variable contain some elements 

      3)      Pubic Boolean add(object):
           This method is used for adding any type of value to any collection frame work variable.
        This method returns Boolean as return type. As long as we call add() w.r.t collection and 
        List interface objects then this method returns true. In case of set ans sorted set if we call 
        this method by adding unique it also returns true.
        If we try to add duplicate elements to set and sorted set then this method returns false.

       4)      Public Boolean addAll(Collection):
           This method is used for adding the content of one collection frame variable to another 
        collection frame work variable.

       5)      Public Iterator iterator():
           The method iterator() retrives all the elements of any collection frame work variables and 
        forms like a chain in the chain of elements, just before the first element an object of Iterator 
        interface object is pointing.

      For Example :
           Iterator itr=c1.iterator();
           int  s=0;
               Integer uo=(Integer)obj;
               int x=io.intValue();
      6)      Public object[] toArray() :
                            This method is used for retrieving all the elements of collection frame work  
                   variable and places in array of objects of Java.lang.Object.
              When object of java.lang.object is holding every type of value, what is need of                 
               collection frame work?
                      An object of java.lang.object is holding multiple values of same types or different  
              types. But the array of objects of java.lang.object is containing fixed size in nature and 
              they are not expandable. Hence in order to hold multiple values of same type or different 
              type with dynamic size in nature we use the concept of collection frame work.

 Data Extraction Interfaces are as follows :

   Iterator (I)
        2)   ListIterator(I)
          3)    Enumeration (I).

          1- D and 2-D Collection Frame work classes are 
        1)  LinkedList 
        2)  ArrayList
        3)  HashMap
        4)  HashSet
        5)   TreeMap
        6)  TreeSet
          7)    Stack
          8)   Vector
          9)   HashTable 
         10)  Dictionary
       11) Properties

        To read the values dynamically from keyboard their is a class.
                 Java.util.Scanner or Scanner class

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