The
SortedSet interface extends
Set Interface In Java and declares the behaviour of a set sorted in ascending order.
In addition to those methods defined by Set, the SortedSet interface includes these methods,
Sorted Set
import java.util.*;
class SortedSetTest
{
public static void main(String arg[])
{
SortedSet<Integer> ss = new TreeSet<Integer>();
ss.add(10);
ss.add(30);
ss.add(98);
ss.add(80);
ss.add(10); // duplicate value
ss.add(99);
System.out.println("SortedSet elements : " + ss);
System.out.print("Iterating SortedSet elements : ");
Iterator it = ss.iterator();
while (it.hasNext()) {
System.out.print(it.next() + " ");
}
System.out.println();
System.out.println("Lowest element : " + ss.first());
System.out.println("Highest element : " + ss.last());
System.out.println("Lesser than elements : " + ss.headSet(80));
System.out.println("Higher than or equals elements : " + ss.tailSet(80));
System.out.println("Range elements : " + ss.subSet(20, 90));
}
}
OUTPUTSortedSet elements : [10, 30, 80, 98, 99]
Iterating SortedSet elements : 10 30 80 98 99
Lowest element : 10
Highest element : 99
Lesser than elements : [10, 30]
Higher than or equals elements : [80, 98, 99]
Range elements : [30, 80]
DESCRIPTIONIn this program, a TreeSet is assigned to SortedSet object, six elements are added to it in which one is duplicate and then SortedSet methods like first, headSet, last, subSet and tailSet are applied. It stores the unique elements in ascending order.
THINGS TO TRY
- Add
88 to the SortedSet and see the output is in ascending order or not.
- You can obtain a set from the sortedSet by using
headSet, tailSet and subSet methods. Try with replacing 80 by 30 in tailSet method.
- Create a new sortedSet for
String names and see the names are showing in ascending order or not.
