Examples show you how to convert between int[] and its’ wrapper class Integer[].

1. Convert int[] to Integer[]

	public static Integer[] toObject(int[] intArray) {
		Integer[] result = new Integer[intArray.length];
		for (int i = 0; i < intArray.length; i++) {
			result[i] = Integer.valueOf(intArray[i]);
		return result;

2. Convert Integer[] to int[]

	public static int[] toPrimitive(Integer[] IntegerArray) {
		int[] result = new int[IntegerArray.length];
		for (int i = 0; i < IntegerArray.length; i++) {
			result[i] = IntegerArray[i].intValue();
		return result;

The theory is simple, create a new array, and dump the old value inside.

1. Full Example

Review a full example to show you how it works.

package com.mkyong.test;
public class ArrayConvertExample {
	public static void main(String[] args) {
		int[] obj = new int[] { 1, 2, 3 };
		Integer[] newObj = toObject(obj);
		System.out.println("Test toObject() - int -> Integer");
		for (Integer temp : newObj) {
			System.out.println(temp);
		Integer[] obj2 = new Integer[] { 4, 5, 6 };
		int[] newObj2 = toPrimitive(obj2);
		System.out.println("Test toPrimitive() - Integer -> int");
		for (int temp : newObj2) {
			System.out.println(temp);
	// Convert int[] to Integer[]
	public static Integer[] toObject(int[] intArray) {
		Integer[] result = new Integer[intArray.length];
		for (int i = 0; i < intArray.length; i++) {
			result[i] = Integer.valueOf(intArray[i]);
		return result;
	// Convert Integer[] to int[]
	public static int[] toPrimitive(Integer[] IntegerArray) {
		int[] result = new int[IntegerArray.length];
		for (int i = 0; i < IntegerArray.length; i++) {
			result[i] = IntegerArray[i].intValue();
		return result;

Output

Test toObject() - int -> Integer
Test toPrimitive() - Integer -> int

2. ArrayUtils Example

To save you time, uses the ArrayUtils class from the Apache common library, it does the same thing.

package com.mkyong.test;
import org.apache.commons.lang3.ArrayUtils;
public class ArrayConvertExample {
	public static void main(String[] args) {
		int[] obj = new int[] { 1, 2, 3 };
		Integer[] newObj = ArrayUtils.toObject(obj);
		System.out.println("Test toObject() - int -> Integer");
		for (Integer temp : newObj) {
			System.out.println(temp);
		Integer[] obj2 = new Integer[] { 4, 5, 6 };
		int[] newObj2 =	ArrayUtils.toPrimitive(obj2);
		System.out.println("Test toPrimitive() - Integer -> int");
		for (int temp : newObj2) {
			System.out.println(temp);

Test toObject() - int -> Integer
Test toPrimitive() - Integer -> int

References

1. Apache ArrayUtils JavaDoc
2. Primitive wrapper class