java数据结构之希尔排序

import java.util.Arrays;
public class Demo4 {
 public static void main(String[] args) {
 int old[] = { 2, 5, 3, 8, 6, 9, 4 };
 int i,j,temp; 
 int gap = 1; 
 int len = old.length; 
 while (gap < len / 3) { 
  gap = gap * 3 + 1; 
 } 
 for (; gap > 0; gap /= 3) { 
  for (i = gap; i < len; i++) { 
   temp = old[i]; 
   for (j = i - gap; j >= 0 && old[j] > temp; j -= gap) { 
    old[j + gap] = old[j]; 
   } 
   old[j + gap] = temp; 
  } 
 } 
 System.out.println("new:"+Arrays.toString(old)); 
 }
}