Java Array Swap swap(T[] arr, int a, int b)

Description

Swaps the elements at position a and b in the array arr.

License

Open Source License

Parameter

Parameter	Description
T	Type of array elements
arr	Array that contains the elements to be swapped
a	First position
b	Second position

Declaration

public static <T> void swap(T[] arr, int a, int b) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /**//from   w w  w . ja  v  a  2  s. c om
     * Swaps the elements at position <code>a</code> and <code>b</code> in the
     * array <code>arr</code>.
     * 
     * @param <T>
     *            Type of array elements
     * @param arr
     *            Array that contains the elements to be swapped
     * @param a
     *            First position
     * @param b
     *            Second position
     */
    public static <T> void swap(T[] arr, int a, int b) {
        if (a < 0 || a > arr.length || b < 0 || b > arr.length)
            throw new IllegalArgumentException("swap position out of bounds.");
        if (a != b) {
            T t = arr[a];
            arr[a] = arr[b];
            arr[b] = t;
        }
    }
}

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