Java-the SortedMap Interface

The SortedMap interface extends Map. It ensures that the entries is maintained in ascending key order

Several methods throw a nosuchelementexception when no items is in the invoking map. A ClassCastException is thrown if an object was incompatible with the elements in a map. A NullPointerException is thrown if an attempt was made to use a null object when NULL is not allowed in the map.

The methods declared by SortedMap is summarized in the following table:

SN	Methods with Description
1	Comparator Comparator () Returns the invoking sorted map ' s comparator. If The natural ordering is used for the invoking map, and Null is returned.
2	Object Firstkey () Returns the first key in the invoking map.
3	SortedMap Headmap (Object end) Returns a sorted map for those map entries with keys, is less than end.
4	Object Lastkey () Returns the last key in the invoking map.
5	SortedMap SubMap (object start, Object end) Returns A map containing those entries with keys that is greater than or equal to start and less than end
6	SortedMap Tailmap (Object start) Returns A map containing those entries with keys that is greater than or equal to start.

Example:

SortedMap has its implementation in various classes like TREEMAP, following are the example to explain SortedMap functionl Aity:

ImportJava.Util.*;Public Class Treemapdemo { Public Static voidMain(StringArgs[]) { Create a hash map TreeMapTm= New TreeMap(); Put elements to the mapTm.Put("Zara", New Double(3434.34));Tm.Put("Mahnaz", New Double(123.22));Tm.Put("Ayan", New Double(1378.00));Tm.Put("Daisy", New Double(99.22));Tm.Put("Qadir", New Double(-19.08)); Get a set of the entries Set Set =Tm.EntrySet(); Get an iterator IteratorI= Set.Iterator(); Display elements While(I.Hasnext()) { Map.EntryMe= (Map.Entry)I.Next(); System.Out.Print(Me.GetKey() + ": "); System.Out.println(Me.GetValue()); } System.Out.println(); Deposit to Zara ' s account DoubleBalance= ((Double)Tm.Get("Zara")).Doublevalue();Tmput ( "Zara" , new double (balance Span class= "pun" >+ 1000); system.. Println ( "Zara ' s New Balance:"  + Tm. Get "Zara" }}          /span>                

This would produce the following result:

Ayan:1378.0Daisy99.22Mahnaz:123.22Qadir:-19.08Zara  :3434.34Zara.  s current balance:4434.34            

Java-the SortedMap Interface