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
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问题描述
我有一个包含星期几名称,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();
样本数据:
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,以使星期几按升序排列.并且如果有多个记录具有相同的星期几,则开始时间也应按升序排列.
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,上面的列表应如下所示:
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
在这里:
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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