Module org.jgrapht.core

Package org.jgrapht.util

Class ArrayUtil

java.lang.Object

org.jgrapht.util.ArrayUtil

public class ArrayUtil
extends Object

Utility class to simplify handling of arrays.

Author:

Hannes Wellmann

Method Summary

Modifier and Type	Method	Description
static void	reverse(int[] arr, int from, int to)	Reverses the order of the elements in the specified range within the given array.
static <V> void	reverse(V[] arr, int from, int to)	Reverses the order of the elements in the specified range within the given array.
static void	swap(double[] arr, int i, int j)	Swaps the two elements at the specified indices in the given double array.
static void	swap(int[] arr, int i, int j)	Swaps the two elements at the specified indices in the given int array.
static <V> void	swap(V[] arr, int i, int j)	Swaps the two elements at the specified indices in the given array.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

reverse

public static final <V> void reverse(V[] arr,
                                     int from,
                                     int to)

Reverses the order of the elements in the specified range within the given array.

Type Parameters:

V - the type of elements in the array

Parameters:

arr - the array

from - the index of the first element (inclusive) inside the range to reverse

to - the index of the last element (inclusive) inside the range to reverse

Throws:

NullPointerException - if arr == null

ArrayIndexOutOfBoundsException - if either one of from or to is out of bounds

reverse

public static final void reverse(int[] arr,
                                 int from,
                                 int to)

Reverses the order of the elements in the specified range within the given array.

Parameters:

arr - the array

from - the index of the first element (inclusive) inside the range to reverse

to - the index of the last element (inclusive) inside the range to reverse

Throws:

NullPointerException - if arr == null

ArrayIndexOutOfBoundsException - if either one of from or to is out of bounds

swap

public static final <V> void swap(V[] arr,
                                  int i,
                                  int j)

Swaps the two elements at the specified indices in the given array.

Type Parameters:

V - the type of elements in the array

Parameters:

arr - the array

i - the index of the first element

j - the index of the second element

Throws:

NullPointerException - if arr == null

ArrayIndexOutOfBoundsException - if either one of i or j is out of bounds

swap

public static void swap(double[] arr,
                        int i,
                        int j)

Swaps the two elements at the specified indices in the given double array.

Parameters:

arr - the array

i - the index of the first element

j - the index of the second element

Throws:

NullPointerException - if arr == null

ArrayIndexOutOfBoundsException - if either one of i or j is out of bounds

Since:

1.5.3

swap

public static void swap(int[] arr,
                        int i,
                        int j)

Swaps the two elements at the specified indices in the given int array.

Parameters:

arr - the array

i - the index of the first element

j - the index of the second element

Throws:

NullPointerException - if arr == null

ArrayIndexOutOfBoundsException - if either one of i or j is out of bounds

Since:

1.5.3