我如何检查期间（月）之间的2个日期

Question

i have 2 Date ( start_date , end_date ) with yyyy-MM-dd format and i want to check that if the month between in december 01 - march 31 then do something. For example my start_date is 2015-12-01 or 2016-02-01 and end_date 2016-02-12 then write something. I have this

public void meethod(){
     DateFormat df = new SimpleDateFormat("yyyy-MM-dd"); 
     Date startDate = null;
     Date endDate = null;

     try {
         startDate = df.parse(tf_start_date.getText());
         endDate = df.parse(tf_end_date.getText());
     } catch (ParseException e) {
         e.printStackTrace();
     }

     if( /* what goes here? */ ) {
        System.out.println("its between december-march");
     } else {

     }
 } 

tf_start_date and tf_end_date is a TextField and the value of TextFields like 2015-02-03

Answer 1

First, you should probably be using Calendar rather than Date . First, you'll need to construct the Calendar using a Calendar.Builder :

Calendar startCal = Calendar.Builder().setInstant(startDate);
Calendar endCal = Calendar.Builder().setInstant(endDate);

Then you can just check their months to see if they are one of the months you're looking for:

int startMonth = startCal.get(Calendar.MONTH);
if (startMonth == Calendar.DECEMBER ||
    startMonth == Calendar.JANUARY ||
    startMonth == Calendar.FEBRUARY ||
    startMonth == Calendar.MARCH)

Similarly with endMonth .