6Java shell希尔排序

Posted 2021-04-25 菜鸟学编程

Java shell希尔排序

---

package sort;

import static sort.SortUtils.*;


/**
 * @author dpunosevac
 *
 *
 * @see SortAlgorithm
 *
 */
public class ShellSort implements SortAlgorithm {

  /**
   * This method implements Generic Shell Sort.
   * @param array The array to be sorted
   */
  @Override
  public <T extends Comparable<T>> T[] sort(T[] array) {
    int N = array.length;
    int h = 1;

    while (h < N/3) {
        h = 3 * h + 1;
    }

    while (h >= 1) {
        for (int i = h; i < N; i++) {
            for (int j = i; j >= h && less(array[j], array[j-h]); j -= h) {
                swap(array, j, j - h);
            }
        }

        h /= 3;
    }

    return array;
  }

  public static void main(String[] args) {
      Integer[] toSort = {4, 23, 6, 78, 1, 54, 231, 9, 12};

      ShellSort sort = new ShellSort();
      Integer[] sorted = sort.sort(toSort);

      print(sorted);

  }
}