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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]
Updated on: 29-Jun-2020
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