array swap java

1public static void swap(int x, int y, int[] arr) {
2  	int temp = arr[x];
3  	arr[x] = arr[y];
4  	arr[y] = temp;
5}

1public static final <T> void swap (T[] a, int i, int j) {
2  T t = a[i];
3  a[i] = a[j];
4  a[j] = t;
5}
6
7public static final <T> void swap (List<T> l, int i, int j) {
8  Collections.<T>swap(l, i, j);
9}
10
11private void test() {
12  String [] a = {"Hello", "Goodbye"};
13  swap(a, 0, 1);
14  System.out.println("a:"+Arrays.toString(a));
15  List<String> l = new ArrayList<String>(Arrays.asList(a));
16  swap(l, 0, 1);
17  System.out.println("l:"+l);
18}
19

1String temp = arr[1];
2arr[1] = arr[2];
3arr[2] = temp;
4