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Java Program to get headset from TreeSet
To get HeadSet from TreeSet, at first create a TreeSet and add some elements:
TreeSet<String> treeSet = new TreeSet<String>();
treeSet.add("ABC");
treeSet.add("DEF");
treeSet.add("GHI");
treeSet.add("JKL");
treeSet.add("MNO");
treeSet.add("PQR");To get headset, use the headset() method:
SortedSet<String> set = treeSet.headSet("MNO");
System.out.println("Head Set = " + set);You can also change the value like this:
set = treeSet.headSet("GHI");
System.out.println("Head Set = " + set);Example
import java.util.SortedSet;
import java.util.TreeSet;
public class Demo {
public static void main(String[] args) {
TreeSet<String> treeSet = new TreeSet<String>();
treeSet.add("ABC");
treeSet.add("DEF");
treeSet.add("GHI");
treeSet.add("JKL");
treeSet.add("MNO");
treeSet.add("PQR");
SortedSet<String> set = treeSet.headSet("MNO");
System.out.println("Head Set = " + set);
set = treeSet.headSet("GHI");
System.out.println("Head Set = " + set);
set = treeSet.headSet("ABC");
System.out.println("Head Set = " + set);
}
}Output
Head Set = [ABC, DEF, GHI, JKL] Head Set = [ABC, DEF] Head Set = []
Updated on: 30-Jul-2019
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