How do I remove the first or the last found element from Deque?

This example demonstrates the use of Deque.removeFirstOccurrence() method call to remove the first occurrences of an element in the Deque object and Deque.removeLastOccurrence() method call to remove the last occurrences of an element in the Deque object.

package org.kodejava.example.util;

import java.util.Deque;
import java.util.Iterator;
import java.util.LinkedList;

public class DequeRemoveDemo {
    public static void main(String[] args) {
        Deque<String> deque1 = new LinkedList<>();
        deque1.offer("a");
        deque1.offer("b");
        deque1.offer("c");
        deque1.offer("d");
        deque1.offer("e");
        deque1.offer("d");

        Deque<String> deque2 = new LinkedList<>(deque1);

        // Removes the first occurrence of letter "d" from deque1
        deque1.removeFirstOccurrence("d");

        Iterator first = deque1.iterator();
        System.out.println("After removeFirstOccurrence(Object o): ");
        System.out.println("=======================================");
        while (first.hasNext()) {
            System.out.println(first.next());
        }

        // Removes the last occurrence of letter "d" from deque2
        deque2.removeLastOccurrence("d");
        Iterator last = deque2.iterator();
        System.out.println("After removeLastOccurrence(Object o): ");
        System.out.println("========================================");
        while (last.hasNext()) {
            System.out.println(last.next());
        }
    }
}

Wayan Saryada

Founder at Kode Java Org
I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. You can support my works by donating here. Thank you 🙂.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.