就是这个题了，我弄了一下午，一直没找到错在哪？无语

public class TestDateSort {
    public static void main(String[] args) {
     Date[] days = new Date[5];
     days[0] = new Date(2006, 1, 1);
     days[1] = new Date(2006, 1, 2);
     days[2] = new Date(2006, 1, 1);
     days[3] = new Date(2010, 2, 3);
     days[4] = new Date(2010, 2, 1);
     bubbleSort(days);
     for(int i = 0;i<days.length;i++)
     System.out.println(days[i]);
            }
            
 public static Date[] bubbleSort(Date[] a) {
                int t= a.length;
                for(int i = t-1;i>=1;i--) {
                    for(int j = 0;j<i-1;j++) {
                        if(a[j].compare(a[j+1])>0) {
                            Date temp = a[j];
                            a[j] = a[j+1];
                            a[j+1] = temp;
                            }
                        }
                    }
                    return a;
                }
    }

对着正确答案，一步一步的看，一模一样，还是错

也不对，正确答案里没用包