我简单试了几个样例 没问题。有问题麻烦大家评论 public class Main{ public static void main(String[] args){ Scanner sc = new Scanner(System.in); int n = sc.nextInt(); String[] datetime = new String[n]; for(int i = 0; i < n; i ++) datetime[i] = sc.next(); Comparator<String> cmp = new Comparator<String>() { public int compare(String a, String b){ String dtA = getDT(a), dtB = getDT(b); return dtA.compareTo(dtB); } }; Arrays.sort(datetime,cmp); for(int i = 0; i < n; i ++) System.out.println(datetime[i]); } public static String getDT(String ts){ String[] datatime = new String[4]; String[] date = ts.split(":"); datatime[0] = date[0]; datatime[1] = date[1]; String[] time = date[2].split("\\."); datatime[2] = time[0]; datatime[3] = time[1]; if(datatime[0].length() < 2) datatime[0] = "0"+datatime[0]; if(datatime[1].length() < 2) datatime[1] = "0"+datatime[1]; if(datatime[2].length() < 2) datatime[2] = "0"+datatime[2]; int k = 3 - datatime[3].length(); while(k>0) { datatime[3] = "0"+datatime[3]; k--; } String rst = ""; for(int i = 0; i < 4; i++){ rst += datatime[i]; } return rst; } }