ArrayUtils (micronaut 3.4.0 API)

java.lang.Object
- io.micronaut.core.util.ArrayUtils

```
public class ArrayUtils
extends Object
```
Utility methods for working with arrays.

Since:

1.0

Author:

Graeme Rocher

Field Summary

Fields
Modifier and Type	Field and Description
`static boolean[]`	`EMPTY_BOOLEAN_ARRAY` An empty boolean array.
`static byte[]`	`EMPTY_BYTE_ARRAY` An empty byte array.
`static char[]`	`EMPTY_CHAR_ARRAY` An empty char array.
`static double[]`	`EMPTY_DOUBLE_ARRAY` An empty double array.
`static float[]`	`EMPTY_FLOAT_ARRAY` An empty float array.
`static int[]`	`EMPTY_INT_ARRAY` An empty int array.
`static long[]`	`EMPTY_LONG_ARRAY` An empty long array.
`static Object[]`	`EMPTY_OBJECT_ARRAY` An empty object array.
`static short[]`	`EMPTY_SHORT_ARRAY` An empty short array.

Constructor Summary

Constructors
Constructor and Description

ArrayUtils()

Constructors
Constructor and Description
`ArrayUtils()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static byte[]`	`concat(byte[] a, byte... b)` Concatenate two byte arrays.
`static <T> T[]`	`concat(T[] a, T... b)` Concatenate two arrays.
`static boolean`	`isEmpty(Object[] array)` Whether the given array is empty.
`static boolean`	`isNotEmpty(Object[] array)` Whether the given array is not empty.
`static <T> Iterator<T>`	`iterator(T... array)` Produce an iterator for the given array.
`static <T> Iterator<T>`	`reverseIterator(T... array)` Produce an iterator for the given array.
`static <T> T[]`	`toArray(Collection<T> collection, Class<T> arrayItemClass)` Returns an array containing all of the elements in this collection, using the item class.
`static <T> T[]`	`toArray(Collection<T> collection, IntFunction<T[]> createArrayFn)` Returns an array containing all of the elements in this collection, using the provided generator function to allocate the returned array.
`static Object`	`toPrimitiveArray(Object[] wrapperArray)` Converts a primitive wrapper array to the equivalent primitive array such as Integer[] to int[].
`static String`	`toString(Object[] array)` Produce a string representation of the given array.
`static String`	`toString(String delimiter, Object[] array)` Produce a string representation of the given array.
`static Object[]`	`toWrapperArray(Object primitiveArray)` Converts a primitive array to the equivalent wrapper such as int[] to Integer[].

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - EMPTY_OBJECT_ARRAY
```
public static final Object[] EMPTY_OBJECT_ARRAY
```
    An empty object array.
  - EMPTY_BOOLEAN_ARRAY
```
public static final boolean[] EMPTY_BOOLEAN_ARRAY
```
    An empty boolean array.
  - EMPTY_BYTE_ARRAY
```
public static final byte[] EMPTY_BYTE_ARRAY
```
    An empty byte array.
  - EMPTY_CHAR_ARRAY
```
public static final char[] EMPTY_CHAR_ARRAY
```
    An empty char array.
  - EMPTY_INT_ARRAY
```
public static final int[] EMPTY_INT_ARRAY
```
    An empty int array.
  - EMPTY_DOUBLE_ARRAY
```
public static final double[] EMPTY_DOUBLE_ARRAY
```
    An empty double array.
  - EMPTY_LONG_ARRAY
```
public static final long[] EMPTY_LONG_ARRAY
```
    An empty long array.
  - EMPTY_FLOAT_ARRAY
```
public static final float[] EMPTY_FLOAT_ARRAY
```
    An empty float array.
  - EMPTY_SHORT_ARRAY
```
public static final short[] EMPTY_SHORT_ARRAY
```
    An empty short array.
- Constructor Detail
  - ArrayUtils
```
public ArrayUtils()
```
- Method Detail
  - concat
```
public static <T> T[] concat(T[] a,
                             T... b)
```
    Concatenate two arrays.
    
    Type Parameters:
    
    T - The array type
    
    Parameters:
    
    a - The first array
    
    b - The second array
    
    Returns:
    
    The concatenated array
  - concat
```
public static byte[] concat(byte[] a,
                            byte... b)
```
    Concatenate two byte arrays.
    
    Parameters:
    
    a - The first array
    
    b - The second array
    
    Returns:
    
    The concatenated array
  - isEmpty
```
public static boolean isEmpty(Object[] array)
```
    Whether the given array is empty.
    
    Parameters:
    
    array - The array
    
    Returns:
    
    True if it is
  - isNotEmpty
```
public static boolean isNotEmpty(Object[] array)
```
    Whether the given array is not empty.
    
    Parameters:
    
    array - The array
    
    Returns:
    
    True if it is
  - toString
```
public static String toString(@Nullable
                              Object[] array)
```
    Produce a string representation of the given array.
    
    Parameters:
    
    array - The array
    
    Returns:
    
    The string representation
  - toString
```
public static String toString(String delimiter,
                              @Nullable
                              Object[] array)
```
    Produce a string representation of the given array.
    
    Parameters:
    
    delimiter - The delimiter
    
    array - The array
    
    Returns:
    
    The string representation
  - iterator
```
public static <T> Iterator<T> iterator(T... array)
```
    Produce an iterator for the given array.
    
    Type Parameters:
    
    T - The array type
    
    Parameters:
    
    array - The array
    
    Returns:
    
    The iterator
  - reverseIterator
```
public static <T> Iterator<T> reverseIterator(T... array)
```
    Produce an iterator for the given array.
    
    Type Parameters:
    
    T - The array type
    
    Parameters:
    
    array - The array
    
    Returns:
    
    The iterator
  - toArray
```
public static <T> T[] toArray(Collection<T> collection,
                              IntFunction<T[]> createArrayFn)
```
    Returns an array containing all of the elements in this collection, using the provided generator function to allocate the returned array.
    
    Type Parameters:
    
    T - The type of the array
    
    Parameters:
    
    collection - The collection
    
    createArrayFn - The function to create the array
    
    Returns:
    
    The array
  - toArray
```
public static <T> T[] toArray(Collection<T> collection,
                              Class<T> arrayItemClass)
```
    Returns an array containing all of the elements in this collection, using the item class.
    
    Type Parameters:
    
    T - The type of the array
    
    Parameters:
    
    collection - The collection
    
    arrayItemClass - The array item class
    
    Returns:
    
    The array
    
    Since:
    
    3.0
  - toWrapperArray
```
public static Object[] toWrapperArray(Object primitiveArray)
```
    Converts a primitive array to the equivalent wrapper such as int[] to Integer[].
    
    Parameters:
    
    primitiveArray - The primitive array
    
    Returns:
    
    The primitive array wrapper.
    
    Since:
    
    3.0.0
  - toPrimitiveArray
```
public static Object toPrimitiveArray(Object[] wrapperArray)
```
    Converts a primitive wrapper array to the equivalent primitive array such as Integer[] to int[].
    
    Parameters:
    
    wrapperArray - The wrapper array
    
    Returns:
    
    The primitive array.
    
    Since:
    
    3.0.0

Class ArrayUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

EMPTY_OBJECT_ARRAY

EMPTY_BOOLEAN_ARRAY

EMPTY_BYTE_ARRAY

EMPTY_CHAR_ARRAY

EMPTY_INT_ARRAY

EMPTY_DOUBLE_ARRAY

EMPTY_LONG_ARRAY

EMPTY_FLOAT_ARRAY

EMPTY_SHORT_ARRAY

Constructor Detail

ArrayUtils

Method Detail

concat

concat

isEmpty

isNotEmpty

toString

toString

iterator

reverseIterator

toArray

toArray

toWrapperArray

toPrimitiveArray