(Java) 2014年1月1日减一个月涉及时间与字符的转换

 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;

 public class TestMinusOneMonth {

     public static void main(String[] args) {
         String string = "2014-01-01";
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
         try {
             Date date = sdf.parse(string);
             Calendar calendar = Calendar.getInstance();
             calendar.setTime(date);
             calendar.add(Calendar.MONTH, -1);
             date = calendar.getTime();
             string = sdf.format(date);
             System.out.println(string); //2013-12-01
         } catch (ParseException e) {
             e.printStackTrace();
         }
     }
 }