public class SelectionSort {

    private SelectionSort() {
    }

    public static <E extends Comparable<E>> void sort(E[] arr) {
        for (int i = 0; i < arr.length; i++) {
            //选择arr[i...n)中最小值的索引
            int minIdx = i;
            for (int j = i; j < arr.length; j++) {
                if (arr[j].compareTo(arr[minIdx]) < 0) {
                    minIdx = j;
                }
            }
            swap(arr, i, minIdx);
        }
    }

    private static <E> void swap(E[] arr, int i, int minIdx) {
        E temp = arr[i];
        arr[i] = arr[minIdx];
        arr[minIdx] = temp;
    }
}