Java获得当前时间前指定几个小时具体时间的方法示例

package getBeforeHourDemo;import java.text.SimpleDateFormat;import java.util.Calendar;//获取当前时间，指定前面多少小时的时间 //返回格式YYYYMMDDHHMMSS public class getBeforeHourTime {  public static String getBeforeByHourTime(int ihour){      String returnstr = "";      Calendar calendar = Calendar.getInstance();      calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) - ihour);      SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");      returnstr = df.format(calendar.getTime());      return returnstr;   }   public static void main(String[] args) {    String beforetime=getBeforeByHourTime(2);    System.out.println(beforetime);   }}