Java LinkedList push() Method

The LinkedList.push(E e) method in Java is used to add an element to the front of the LinkedList. This guide will cover the method’s usage, explain how it works, and provide examples to demonstrate its functionality.

Table of Contents

1. Introduction
2. push Method Syntax
3. Examples
   • Adding an Element to the Front
   • Handling Null Values
4. Conclusion

Introduction

The LinkedList.push(E e) method is a member of the LinkedList class in Java. It is part of the Deque interface and allows you to add an element to the front of the LinkedList, effectively making it the top element of the stack.

push Method Syntax

The syntax for the push method is as follows:

public void push(E e)

• e: The element to be added to the front of the LinkedList.

Examples

Adding an Element to the Front

The push method can be used to add an element to the front of a LinkedList.

Example

import java.util.LinkedList;

public class PushExample {
    public static void main(String[] args) {
        // Creating a LinkedList of Strings
        LinkedList<String> list = new LinkedList<>();

        // Adding elements to the LinkedList using push()
        list.push("Apple");
        list.push("Banana");
        list.push("Orange");

        // Printing the LinkedList
        System.out.println("LinkedList: " + list);
    }
}

Output:

LinkedList: [Orange, Banana, Apple]

Handling Null Values

The push method can handle null values. Adding a null value to a LinkedList will include null as an element at the front of the list.

Example

import java.util.LinkedList;

public class PushNullExample {
    public static void main(String[] args) {
        // Creating a LinkedList of Strings
        LinkedList<String> list = new LinkedList<>();

        // Adding elements to the LinkedList, including null
        list.push("Apple");
        list.push(null);
        list.push("Banana");

        // Printing the LinkedList
        System.out.println("LinkedList: " + list);
    }
}

Output:

LinkedList: [Banana, null, Apple]

Conclusion

The LinkedList.push(E e) method in Java provides a way to add elements to the front of a LinkedList, similar to how elements are pushed onto a stack. By understanding how to use this method, you can efficiently manage collections of objects in your Java applications. Whether you are adding elements to the front of the list or handling potential null values, the push method provides a flexible solution for these tasks.