Core java collection framework interview questions and answers second part...

                                           



1: which classes of collection framework that takes only homogeneous (same type) objects only.
Ans: Only there are two classes that takes homogeneous elements those are TreeSet and TreeMap.
                                               
 
2: How ArrayList work's internally?
Ans: 
           Example : 

     ArrayList :    | 1 | 5 | 6 | 9 | 4 | 5 | 2 | 11 |
     Size : 8
     index : 0 - 7

arraylist is same as an array but it's dynamic array so, it increases it's size when required.

   when you create a arraylist object initially it's size will be 10, and as you inter any value that 
will go in in index 0 , and it's the starting index. 
  
 in the above example we have an arraylist that contains 8 elements and new it's full so if we try to insert more element in this list then automatically JVM create a new ArrayList and Copy all the data from this list and past it into the newly created list. and the size of the new list will we 16. 

Size of ArrayList increases with n+n/2+1 always. Default capacity of ArrayList is 10.

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