Java compares the time difference several months __java

Java comparison time differs by several months

Do project today encounter data returning 6 months from the current month

CompareTo method of new characteristic yearmonth of scheme 1::java1.8

Compare the same year, such as the current August 2017, incoming parameters 2017, 2, print: 6

But not in the same year, such as incoming parameters 2016, 2, expected to print: 18, but the actual print is: 1

So continue the test, pass in the parameter 2015, 2, expect to print: 30, but the actual print is: 2

Visible Yearmonth CompareTo method when the return value is a few months in the same year, and when the difference is over a few years, it is not a current requirement.

/**
     * Use Yearmonth method CompareTo compare two time difference a few months
     * @param year
     * @param month month/
     public
    Void Testyearmonth (int year, int month) {
        Yearmonth yearmonth = Yearmonth.of (year, month);
        Current month
        yearmonth Yearmonthnow = Yearmonth.now ();
        int difference = Yearmonthnow.compareto (yearmonth);
        SYSTEM.OUT.PRINTLN (difference);
    }

Scenario 2: Use calender to compare years, then compare months, the difference between the years multiplied by 12 plus the difference between the month of the total month, resolved.

/**
     * Compare time to the current time distance of several months
     *
     * @param datestr incoming time string, format yyyymmddhhmmss
     * * @return * *
    private int Comparewithnow (String datestr) {
        SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-mm");
        String afferentyearmonth = Dateutil.getstringsim (Datestr, "Yyyymmddhhmmss", "yyyy-mm");
        String nowyearmonth = Yearmonth.now (). toString ();
        Calendar afferent = Calendar.getinstance ();
        Calendar now = Calendar.getinstance ();
        try {
            afferent.settime (Sdf.parse (Afferentyearmonth));
            Now.settime (Sdf.parse (Nowyearmonth));
        } catch (ParseException e) {
            e.printstacktrace ();
        }
        int year = (Now.get (calendar.year)-Afferent.get (calendar.year)) *;
        int month = Now.get (calendar.month)-Afferent.get (calendar.month);
        Return Math.Abs (year + month);
    }