ArrayList

Convert ArrayList to Object array example

With this example we are going to demonstrate how to convert an ArrayList to Object array. The array will contain all of the elements existing in the ArrayList. In short, to convert an ArrayList to Object array you should:

  • Create a new ArrayList.
  • Populate the arrayList with elements, using add(E e) API method of ArrayList.
  • Use toArray() API method of ArrayList. The method returns an array containing all of the elements in this list. The elements in the array are in proper sequence (from first to last element).

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.util.ArrayList;
 
public class ConvertArrayListToObjectArray {
 
  public static void main(String[] args) {

    // Create an ArrayList and populate it with elements
    ArrayList arrayList = new ArrayList();
    arrayList.add("element_1");
    arrayList.add("element_2");
    arrayList.add("element_3");
    arrayList.add("element_4");
 
    // toArray() returns an array containing all of the elements in this list in the correct order
    Object[] objArray = arrayList.toArray();
 
    System.out.println("Elements in Array :");
    for(int i=0; i < objArray.length ; i++)

System.out.println(objArray[i]);
  }
}

Output:

Elements in Array :
element_1
element_2
element_3
element_4

 
This was an example of how to convert an ArrayList to Object array in Java.

Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.
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