Exception in thread "main" java.lang.IllegalArgumentException

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1、错误描述

Exception in thread "main" java.lang.IllegalArgumentException: Cannot format given Object as a Dateat java.text.DateFormat.format(DateFormat.java:301)at java.text.Format.format(Format.java:157)at com.you.util.DateBefore.getMonthBefore(DateBefore.java:24)at com.you.util.DateBefore.main(DateBefore.java:33)

2、错误原因

/** *  */package com.you.util;import java.text.SimpleDateFormat;import java.util.Calendar;/** * @author YouHaidong * */public class DateBefore {/** *  * @return */public static String getMonthBefore(String subStr){Calendar calendar = Calendar.getInstance(); calendar.add(Calendar.MONTH, -12);SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");subStr = sdf.format(calendar);return subStr;}/** * @param args */public static void main(String[] args) {String date = getMonthBefore("2014-02");System.out.println(date);}}

日期格式转化异常

3、解决办法

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