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How to use headSet() method of Java NavigableSet Class
The headset() method returns elements up to a limit defined as a parameter.
First, create a NavigableSet and add elements −
NavigableSet<Integer> set = new TreeSet<>(); set.add(10); set.add(25); set.add(40); set.add(55); set.add(70); set.add(85); set.add(100);
Now, use the headset() method −
set.headSet(55));
The following is an example −
Example
import java.util.NavigableSet;
import java.util.TreeSet;
public class Demo {
public static void main(String[] args) {
NavigableSet<Integer> set = new TreeSet<>();
set.add(10);
set.add(25);
set.add(40);
set.add(55);
set.add(70);
set.add(85);
set.add(100);
System.out.println("Returned Value = " + set.headSet(55));
System.out.println("Returned Value (high endpoint included) = " + set.headSet(55, true));
}
}Output
Returned Value = [10, 25, 40] Returned Value (high endpoint included) = [10, 25, 40, 55]
Updated on: 30-Jul-2019
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