Java Program to Convert the LinkedList into an Array and vice versa

Before you learn about the example, make sure you first visit the following tutorials,

• Java LinkedList Class
• Java Array
• LinkedList Data Structure

Example 1: Convert the LinkedList into Array

import java.util.LinkedList;

class Main {
  public static void main(String[] args) {
    LinkedList<String> languages= new LinkedList<>();

    // Add elements in the linked list
    languages.add("Java");
    languages.add("Python");
    languages.add("JavaScript");
    System.out.println("LinkedList: " + languages);

    // Create a new array of String type
    String[] arr = new String[languages.size()];

    // Convert LinkedList into the string array
    languages.toArray(arr);
    System.out.print("Array: ");
    for(String item:arr) {
      System.out.print(item+", ");
    }
  }
}

Output

LinkedList: [Java, Python, JavaScript]
Array: Java, Python, JavaScript,

In the above example, we have created a linked list named languages. Notice the line,

languages.toArray(arr);

Here, the toArray() method converts the linked list languages into an array. And stores it in the string array arr.

Note: If we don't pass any argument to the toArray() method, the method returns an array of the Object type.

Example 2: Convert Array to LinkedList

import java.util.Arrays;
import java.util.LinkedList;

class Main {
  public static void main(String[] args) {

    // create an array
    String[] array = {"Java", "Python", "C"};
    System.out.println("Array: " + Arrays.toString(array));

    // convert array to a linked list
    LinkedList<String> languages= new LinkedList<>(Arrays.asList(array));

    System.out.println("LinkedList: " + languages);

  }
}

Output

Array: [Java, Python, C]
LinkedList: [Java, Python, C]

In the above example, we have created an array of String type. Notice the expression,

Arrays.asList(array)

Here, the asList() method of the Arrays class converts the specified array into the linked list.