如何按升序对包含星期几名称的字符串进行排序 [英] How to sort strings containing day-of-week names in ascending order

问题描述

我有一个包含星期名称、开始时间和结束时间的字符串列表:

I have a list of Strings containing Day-of-week name, start time and End time:

List<String> eventList = Database.getEventsForThisWeek();

示例数据:

Thursday (13:00 to 14:30)
Saturday (14:20 to 18:10)
Monday (09:00 to 14:25)
Saturday (11:00 to 12:30)

我想对列表进行排序，以便星期几按升序排列.如果有多个记录的星期几相同，那么开始时间也应该按升序排列.

I want to sort the List such a way so that the Day-of-week is in ascending order. and if there are multiple records with the same day-of-week, then the Start time should be in ascending order too.

例如，排序后，上面的列表应该是这样的:

For example, after sorting, the above list should look like:

Monday (09:00 to 14:25)    
Thursday (13:00 to 14:30)
Saturday (11:00 to 12:30)
Saturday (14:20 to 18:10)

对列表进行排序的最佳方法是什么?

What is the best way to sort the List ?

推荐答案

给你:

List<String> dates = Arrays.asList(new String[]{
        "Thursday (13:00 to 14:30)",
        "Saturday (14:20 to 18:10)",
        "Monday (09:00 to 14:25)",
        "Saturday (11:00 to 12:30)"
});
Comparator<String> dateComparator = new Comparator<String>() {
    @Override
    public int compare(String s1, String s2) {
        try{
            SimpleDateFormat format = new SimpleDateFormat("EEE");
            Date d1 = format.parse(s1);
            Date d2 = format.parse(s2);
            if(d1.equals(d2)){
                return s1.substring(s1.indexOf(" ") + 1).compareTo(s2.substring(s2.indexOf(" ") + 1));
            }else{
                Calendar cal1 = Calendar.getInstance();
                Calendar cal2 = Calendar.getInstance();
                cal1.setTime(d1);
                cal2.setTime(d2);
                return cal1.get(Calendar.DAY_OF_WEEK) - cal2.get(Calendar.DAY_OF_WEEK);
            }
        }catch(ParseException pe){
            throw new RuntimeException(pe);
        }
    }
};
Collections.sort(dates, dateComparator);
System.out.println(dates);

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