Java Convert int[] to Integer[] example
By：Roy.LiuLast updated：2019-08-17
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.
ArrayConvertExample.java
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.
ArrayConvertExample.java
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
From：一号门
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