Java排序算法优化--Shell排序【温故而知新】

/** * * @author Fly */public class ShellSort {    public int[] shellsort(int[] a) {        int size = a.length;        for (int step = size / 2; step > 0; step /= 2) {            for (int i = 0; i < step; i++) {                for (int j = i; j < size; j += step) {                    int temp = a[j], k;                    for (k = j; k > i && a[k - step] > temp; k -= step) {                        a[k] = a[k - step];                    }                    a[k] = temp;                }            }        }        return a;    }    public void printArray(int[] a) {        for (int i : a) {            System.out.print(i + ",");        }        System.out.println();    }    public static void main(String[] args) {        int[] a = {2, 3, 1, 5, 7, 8, 9, 0, 11, 10, 12, 13, 14, 4, 6};        ShellSort shellsort = new ShellSort();        shellsort.printArray(a);        shellsort.printArray(shellsort.shellsort(a));    }}