How to convert LinkedList to Array in Java?

Last Updated : 28 Jun, 2022

Given a Linked List in Java, the task is to convert this LinkedList to Array. Examples:

Input: LinkedList: ['G', 'e', 'e', 'k', 's'] Output: Array: ['G', 'e', 'e', 'k', 's'] Input: LinkedList: [1, 2, 3, 4, 5] Output: Array: [1, 2, 3, 4, 5]

Approach:

Get the LinkedList
Convert the LinkedList to Object array using toArray() method.
Convert the Object array to desired type array using Arrays.copyOf() method.
Return the print the Array

Below is the implementation of the above approach:

Java

// Java program to convert  // LinkedList to Array  import java.util.*;  public class GFG {   // Function to convert LinkedList to Array   public static <T> Object[] convertLinkedListToArray(LinkedList<T> linkedList)   {   // Converting LinkedList to Array   Object[] array = linkedList.toArray();   return array;   }   public static void main(String args[])   {   // Creating linked list   LinkedList<String>   linkedList = new LinkedList<String>();   // Adding elements to the linked list   linkedList.add("G");   linkedList.add("e");   linkedList.add("e");   linkedList.add("k");   linkedList.add("s");   // Print the LinkedList   System.out.println("Linked list: "  + linkedList);   // Converting LinkedList to Object Array   Object[] objArray = convertLinkedListToArray(linkedList);   // Convert Object[] to String[]   String[] array = Arrays.copyOf(objArray,   objArray.length,   String[].class);   // Print the String Array   System.out.println("Array: "  + Arrays.toString(array));   }  }

Output:

Linked list: [G, e, e, k, s] Array: [G, e, e, k, s]

Time complexity :

Converting an Linkedlist to an Array takes O(n) time. Every element must be copied. Inserting or removing an element takes O(m) amortized time, where m is the number of elements following the insertion/removal index.

How to convert LinkedList to Array in Java?

R

Similar Reads

Java List Interface

The List Interface in Java extends the Collection Interface and is a part of the java.util package. It is used to store the ordered collections of elements. In a Java List, we can organize and manage the data sequentially. Key Features:Maintained the order of elements in which they are added.Allows

AbstractList in Java with Examples

The AbstractList class in Java is a part of the Java Collection Framework and implements the Collection interface and the AbstractCollection class. AbstractList class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a Rand

ArrayList in Java

Java ArrayList is a part of the collections framework and it is a class of java.util package. It provides us with dynamic-sized arrays in Java. The main advantage of ArrayList is that, unlike normal arrays, we don't need to mention the size when creating ArrayList. It automatically adjusts its capac

LinkedList in Java

Linked List is a part of the Collection framework present in java.util package. This class is an implementation of the LinkedList data structure, which is a linear data structure where the elements are not stored in contiguous locations, and every element is a separate object with a data part and an

Immutable List in Java

ImmutableList, as suggested by the name, is a type of List which is immutable. It means that the content of the List are fixed or constant after declaration, that is, they are read-only. If any attempt made to add, delete and update elements in the List, UnsupportedOperationException is thrown. An I

CopyOnWriteArrayList in Java

CopyOnWriteArrayList class is introduced in JDK 1.5, which implements the List interface. It is an enhanced version of ArrayList in which all modifications (add, set, remove, etc) are implemented by making a fresh copy. It is found in java.util.concurrent package. It is a data structure created to b

Custom ArrayList in Java

Before proceeding further let us quickly revise the concept of the arrays and ArrayList quickly. So in java, we have seen arrays are linear data structures providing functionality to add elements in a continuous manner in memory address space whereas ArrayList is a class belonging to the Collection

Difference Between Synchronized ArrayList and CopyOnWriteArrayList in Java Collection

As we know that the ArrayList is not synchronized, if multiple threads try to modify an ArrayList at the same time, then the final outcome will be non-deterministic. Hence synchronizing the ArrayList is a must to achieve thread safety in a multi-threaded environment. In order to make List objects we

How to remove a SubList from a List in Java

Given a list in Java, the task is to remove all the elements in the sublist whose index is between fromIndex, inclusive, and toIndex, exclusive. The range of the index is defined by the user. Example: Input list = [1, 2, 3, 4, 5, 6, 7, 8], fromIndex = 2, endIndex = 4 Output [1, 2, 5, 6, 7, 8] Input

Randomly Select Items from a List in Java

In this article, we will explore how to efficiently select an element from a list in Java. The basic approach involves generating a random index between 0 and the size of the list, and then using that index to retrieve the item. Different Ways to Select Items from a ListBelow are the different appro

Article Tags :

Practice Tags :