请教：有没有简单的办法获取上个月的年月（格式yyyymm）？例如当前月是201105，上月就是201104
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- Java code
import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class T { public static void main(String[] args) { SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM"); Date date = new Date(); System.out.println(sdf.format(date)); System.out.println(sdf.format(getLastDate(date))); } private static Date getLastDate(Date date) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.MONTH, -1); return cal.getTime(); }}