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Get Head Set from Java TreeSet
To get Head Set, you need to use the headset() method. This allow a user to get a set of elements in sorted order.
Firstly, set the TreeSet and add elements
TreeSet<String> tSet = new TreeSet<String>(); tSet.add("P"); tSet.add("Q"); tSet.add("R"); tSet.add("S");
Let us now get the Head Set
SortedSet s = tSet.headSet("S");
The following is an example to get Head Set from TreeSet in Java
Example
import java.util.*; public class Demo { public static void main(String args[]){ TreeSet<String> tSet = new TreeSet<String>(); tSet.add("P"); tSet.add("Q"); tSet.add("R"); tSet.add("S"); System.out.println("TreeSet elements..."); Iterator i = tSet.iterator(); while(i.hasNext()){ System.out.println(i.next()); } SortedSet s = tSet.headSet("S"); System.out.println("Head Set has = " + s); } }
Output
The output is as follows
TreeSet elements... P Q R S Head Set has = [P, Q, R]
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