一个java小程序，排序用的，可是运行就是排不出正确的由小到大的序
public class BubbleSort {
  public static void main(String[] args) {
  Date[] date = new Date[5];
  date[0] = new Date(2008, 5, 6);
  date[1] = new Date(2009, 9, 4);
  date[2] = new Date(2008, 8, 8);
  date[3] = new Date(2001, 4, 3);
  date[4] = new Date(2009, 3, 2); 
   
  bubbleSort(date);
  for(int i = 0; i < date.length; i++) {
  System.out.println(date[i]);
  }
  }

  public static Date[] bubbleSort(Date[] a) {
  for(int i =a.length-1; i >= 1; i--) {
  for(int j = 0; j <= i-1; i++) {
  if( a[j].compare(a[j+1]) > 0) {
  Date temp = a[j+1];
  a[j+1] =a[j];
  a[j] = temp;
  }
  }
  }
  return a;
  }
   
}

class Date {
  int year, month, day;
  public Date(int Year, int Month, int Day) {
  this.year = Year;
  this.month = Month;
  this.day = Day;
  } 
  public int compare(Date a) {
  return this.year > a.year ? 1
  :this.year < a.year ? 0
  :this.month > a.month ? 1
  :this.month< a.month ? 0
  :this.day > a.day ? 1
  :this.day < a.day ? 0 : -1;
  }
  public String toString() {
  return "year-month-day:"+year+"-"+month+"-"+day;
  }
}

------解决方案--------------------
for(int j = 0; j <= i-1; i++) 
改成for(int j = 0; j <= i-1; j++) 
运行结果：
year-month-day:2001-4-3
year-month-day:2008-5-6
year-month-day:2008-8-8
year-month-day:2009-3-2
year-month-day:2009-9-4
------解决方案--------------------

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Java code
for(int j = 0; j <= i-1; i++) {

改成
Java code
for(int j = 0; j <= i-1; j++) {