Java gets years on the first day of a quarter of errors

1. Description of false narrative

Exception in thread "main" Java.lang.IllegalArgumentException:Cannot format given Object as a dateat Java.text.DateFormat . Format (Unknown source) at Java.text.Format.format (Unknown source) at Com.you.freemarker.model.FirstDayOfQuarter.getFirstDayOfQuarter (FIRSTDAYOFQUARTER.JAVA:50) at Com.you.freemarker.model.FirstDayOfQuarter.main (firstdayofquarter.java:64)

2. Cause of error

Formatted date SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd"); String firstdayofquarter = Sdf.format (Fisrtdayofmonth.getfisrtdayofmonth (year, month));

While Fisrtdayofmonth.getfisrtdayofmonth (year, month) is of type string, the object in the format () method or the date class

3, the solution of the method

Convert Fisrtdayofmonth.getfisrtdayofmonth (year, month) to date

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Java gets years on the first day of a quarter of errors