What is Arrayutils.toPrimitive in Java?
toPrimitive is a static method of the ArrayUtils class that
converts the elements of the Object type to its corresponding primitive type.
The toPrimitive method is not an in-place method and returns a new array consisting of elements present in the passed array with the type converted from Object to primitive.
For example:
- Input Array =
Integer[] integers = {Integer.valueOf(34543234), Integer.valueOf(54342), Integer.valueOf(32)}
Given the array above of type Integer containing the object/boxed values of integer, the method converts the array elements to its primitive type: int.
The table below lists the primitive types and their corresponding Wrapper/Object classes.
| Primitive type | Object type |
|---|---|
| byte | Byte |
| short | Short |
| int | Integer |
| long | Long |
| float | Float |
| double | Double |
| boolean | Boolean |
| char | Character |
ArrayUtils is defined in the Apache Commons Lang package. To add Apache Commons Lang to the Maven Project, add the following dependency to the pom.xml file.
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
For other versions of the commons-lang package, refer to the Maven Repository.
You can import the ArrayUtils class as follows.
import org.apache.commons.lang3.ArrayUtils;
Syntax
public static int[] toPrimitive(final Integer[] array, final int valueForNull)
Parameters
final Integer[] array: the array of typeIntegerfinal int valueForNull: the integer value to replace ifnullvalues are found in the array (optional)
Return value
A new array consisting of the array elements of their corresponding primitive type.
Code
import org.apache.commons.lang3.ArrayUtils;
public class Main {
public static void main(String[] args) {
Integer[] integers = {Integer.valueOf(2343), Integer.valueOf(33), Integer.valueOf(234), null};
int[] intResult = ArrayUtils.toPrimitive(integers, 23);
assert intResult instanceof int[];
Double[] doubles = {Double.valueOf(34543234), Double.valueOf(54342), Double.valueOf(32)};
double[] doubleResult = ArrayUtils.toPrimitive(doubles);
assert doubleResult instanceof double[];
}
}Example 1
- Input array -
Integer[] integers = {Integer.valueOf(2343), Integer.valueOf(33), Integer.valueOf(234), null};
The assert statement is used to check if the return value of the ArrayUtils.toPrimitive for the above array of Integer type is an array of primitive type (i.e, int).
Example 2
- Input array -
Double[] doubles = {Double.valueOf(34543234), Double.valueOf(54342), Double.valueOf(32)};
The assert statement is used to check if the return value of the ArrayUtils.toPrimitive for the above array of Double type is an array of primitive type (i.e, double).
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