SortedSet interface:
SortedSet interface extends Set interface. SortedSet interface maintain ascending order in its elements. Note: SortedSet interface declares its own methods in addition of methods declared in Set interface.
Commonly used methods of SortedSet interface:
1. comparator(): Returns comparator for this sorted set. It returns null if the natural ordering is used for this set.
Syntax: public Comparator comparator().
2. first(): Returns the first element in this sorted set.
Syntax: public Object first().
3. headSet(Object end): Returns a SortedSet containing those elements less than end that are contained in this sorted set.
Syntax: public SortedSet headSet(Object end).
4. last(): Returns the last element in this sorted set.
Syntax: public Object last().
5. subSet(Object start, Object end): Returns a SortedSet containing those elements between start and end -1.
Syntax: public SortedSet subSet(Object start, Object end).
6. tailSet(Object start): Returns a SortedSet that contains those elements greater than or equal to start that are contained in this sorted set.
Syntax: public SortedSet tailSet(Object start).
A simple example of TreeSet class to explain few methods of SortedSet interface.
TreeSetTest.java
import java.util.Iterator; import java.util.Set; import java.util.TreeSet; /** * This class is used to show the TreeSet functionality. * @author w3spoint */ public class TreeSetTest { public static void main(String args[]){ //Create TreeSet object. Set treeSet = new TreeSet(); //Add objects to the HashSet. treeSet.add("Roxy"); treeSet.add("Sunil"); treeSet.add("Sandy"); treeSet.add("Munish"); treeSet.add("Pardeep"); //Print the TreeSet object. System.out.println("TreeSet elements:"); System.out.println(treeSet); //Print the TreeSet elements using iterator. Iterator iterator=treeSet.iterator(); System.out.println("TreeSet elements using iterator:"); while(iterator.hasNext()){ System.out.println(iterator.next()); } } } |
Output:
TreeSet elements: [Munish, Pardeep, Roxy, Sandy, Sunil] TreeSet elements using iterator: Munish Pardeep Roxy Sandy Sunil |
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