Java Date 减一天

public class TestDate {
 /**
  * @param args
  */
 public static void main(String args[]) {
  String strDate = "20080301";
  
  int intYear = ((0, 4));
  int intMonth = ((4, 6));
  int intDate = ((6, 8));
  
  Calendar cal = ();
  (intYear, intMonth - 1, intDate);
  (, -1);
  //Date tempDate = ();
  //Long time = ()/1000) - 60*60*24;
  //tempDate .setTime(startTime*1000);
  
  Date date = ();
  DateFormat df = new SimpleDateFormat("yyyyMMdd");
  
  ((date));
 }
}