What is TreeSet ?

TreeSet extends AbstractSet and implements NavigableSet interface.
Objects are sorted in ascending order.
Access time is much more faster.
It prevents duplicates.
TreeSet uses the objects compareTo() to sort the objects.
Example:
import java.util.*;
class demo
{
public static void main(String[] args){
TreeSet ts=new TreeSet();
ts.add("k");
ts.add("e");
ts.add("a");
ts.add("i");
ts.add("q");
ts.add("m");
ts.add("g");
System.out.println(ts);
}
};
Output:
a,e,g,I,k,q //in sorted order