How to sort Date which is in string format in java?

by

try this

    Collections.sort(datestring, new Comparator<String>() {
        DateFormat f = new SimpleDateFormat("MM/dd/yyyy '@'hh:mm a");
        @Override
        public int compare(String o1, String o2) {
            try {
                return f.parse(o1).compareTo(f.parse(o2));
            } catch (ParseException e) {
                throw new IllegalArgumentException(e);
            }
        }
    });

or with Java 8 

    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy '@'hh:mm a");
    Collections.sort(datestring, (s1, s2) -> LocalDateTime.parse(s1, formatter).
            compareTo(LocalDateTime.parse(s2, formatter)));

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