Array of Objects to Array of primitives

This is an example of how to convert an array of Objects to an array of primitives. We are using the org.apache.commons.lang3.ArrayUtils class, that provides operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like Integer[]). Converting an array of Objects to an array of primitives implies that you should:

  • Create an array of Integer objects.
  • Convert the objects to int primitive type using the toPrimitive(Integer[] array) method of ArrayUtils.
  • You can print the results.

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

package com.javacodegeeks.snippets.core;
import org.apache.commons.lang3.ArrayUtils;

public class ObjArray2PrimArray {
    public static void main(String[] args) {

    	// Array of Integer objects

  Integer[] integers = {new Integer(1), new Integer(2), new Integer(3),

new Integer(4), new Integer(5), new Integer(6),

new Integer(7), new Integer(8), new Integer(9)};

  // Convert objects to int primitive type

  int[] ints = ArrayUtils.toPrimitive(integers);

  // Print result




This was an example of how to convert an array of Objects to an array of primitives 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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