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NavigableSet pollFirst() method in Java

Last Updated : 11 Jul, 2025

The pollFirst() method of

is used to retrieves and removes the first (lowest) element, or returns null if this set is empty.

:

E pollFirst()

Where, E is the type of elements maintained by this Set container.

: This function does not accepts any parameter.

: It returns returns null if this set is empty. Below programs illustrate the pollFirst() method in Java:

: NavigableSet with integer elements.

// A Java program to demonstrate
// pollFirst() method of NavigableSet

import java.util.NavigableSet;
import java.util.TreeSet;

public class GFG {
    public static void main(String[] args)
    {
        NavigableSet<Integer> ns = new TreeSet<>();
        ns.add(0);
        ns.add(1);
        ns.add(2);
        ns.add(3);
        ns.add(4);
        ns.add(5);
        ns.add(6);

        System.out.println("First lowest element removed is : " 
                                              + ns.pollFirst());
    }
}

First lowest element removed is : 0

NavigableSet with string elements.

// A Java program to demonstrate
// pollFirst() method of NavigableSet

import java.util.NavigableSet;
import java.util.TreeSet;

public class GFG {
    public static void main(String[] args)
    {
        NavigableSet<String> ns = new TreeSet<>();
        ns.add("A");
        ns.add("B");
        ns.add("C");
        ns.add("D");
        ns.add("E");
        ns.add("F");
        ns.add("G");

        System.out.println("First lowest element removed is : " 
                                              + ns.pollFirst());
    }
}

First lowest element removed is : A

:

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