How does list get the month within a time interval

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Joda-time joda-time 2.10.5import org.joda.time.DateTime;import java.util.ArrayList;import java.util.List;public class Client {public static void main (String [] args) {Long startTime = 1599148799000L; Long endTime=1599148799000L; DateTime start = new DateTime (startTime); DateTime end = new DateTime (endTime); int oneYear = start.getYear (); int oneMonth = start.getMonthOfYear () Int twoYear = end.getYear (); int twoMonth = end.getMonthOfYear (); List yearMonth = getYearMonth (oneYear,twoYear,oneMonth,twoMonth); System.out.println (yearMonth);} private static List getYearMonth (int oneYear,int twoYear, int oneMonth,int twoMonth) {return getYearMonth (oneYear,twoYear,oneMonth,twoMonth, "-") } private static List getYearMonth (int oneYear,int twoYear, int oneMonth,int twoMonth,String separator) {List yearMonth = new ArrayList (); if (oneYear < twoYear) {if (oneYear + 1 = = twoYear) {/ / two years are relational yearMonth.addAll (getYearMonth (oneYear,separator,oneMonth,12)); yearMonth.addAll (getYearMonth (twoYear,separator,1,twoMonth)) Return yearMonth;} else {while (oneYear < twoYear) {yearMonth.addAll (getYearMonth (oneYear,separator,1,12)); oneYear + = 1;} yearMonth.addAll (getYearMonth (twoYear,separator,1,twoMonth)) }} else {yearMonth.addAll (getYearMonth (twoYear,separator,oneMonth,twoMonth));} return yearMonth;} private static List getYearMonth (int year,String separator, int fromMonth,int toMonth) {List yearMonth = new ArrayList (); for (int I = fromMonth; I