1. Introduction

In Java, ArrayList and LinkedList are two commonly used classes for storing lists of objects. Sometimes, you might need to convert an ArrayList to a LinkedList. This blog post demonstrates how to achieve this conversion in a simple manner.

2. Program Steps

1. Initialize an ArrayList and populate it with some elements.

2. Print out the original ArrayList.

3. Convert the ArrayList to a LinkedList.

4. Print out the resulting LinkedList.

3. Code Program

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class ConvertArrayListToLinkedList {

    public static void main(String[] args) {

        // Step 1: Initialize an ArrayList and populate it with some elements
        List<String> arrayList = new ArrayList<>();
        arrayList.add("Java");
        arrayList.add("Python");
        arrayList.add("C++");

        // Step 2: Print out the original ArrayList
        System.out.println("Original ArrayList: " + arrayList);

        // Step 3: Convert the ArrayList to a LinkedList
        List<String> linkedList = new LinkedList<>(arrayList);

        // Step 4: Print out the resulting LinkedList
        System.out.println("Converted LinkedList: " + linkedList);
    }
}

Output:

Original ArrayList: [Java, Python, C++]
Converted LinkedList: [Java, Python, C++]

4. Step By Step Explanation

Step 1: An ArrayList named arrayList is initialized and populated with the elements "Java", "Python", and "C++".

Step 2: The content of the original ArrayList is printed to the console, displaying: "Original ArrayList: [Java, Python, C++]".

Step 3: The ArrayList is converted to a LinkedList named linkedList by passing arrayList as a parameter to the LinkedList constructor. This creates a new LinkedList containing the same elements as the original ArrayList.

Step 4: The content of the resulting LinkedList is printed to the console, confirming that it contains the same elements as the ArrayList. The output is: "Converted LinkedList: [Java, Python, C++]".