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How to convert LinkedList to Array in Java?
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How to convert LinkedList to Array in Java?

Last Updated : 28 Jun, 2022
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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:

  1. Get the LinkedList
  2. Convert the LinkedList to Object array using toArray() method.
  3. Convert the Object array to desired type array using Arrays.copyOf() method.
  4. 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.


Next Article
How to convert LinkedList to Array in Java?

R

RishabhPrabhu
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Article Tags :
  • Java
  • Java-Collections
  • Java-Arrays
  • java-LinkedList
  • Java-Array-Programs
  • Java-List-Programs
Practice Tags :
  • Java
  • Java-Collections

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