java中怎么判断是星期几？

  /** 
    * 判断当前日期是星期几<br> 
    * <br> 
    * @param pTime 修要判断的时间<br> 
    * @return dayForWeek 判断结果<br> 
    * @Exception 发生异常<br> 
    */  
public static int dayForWeek(String pTime) throws Exception {  
 format = new SimpleDateFormat("yyyy-MM-dd");  
 Calendar c = Calendar.getInstance();  
 c.setTime(format.parse(pTime));  
 int dayForWeek = 0;  
 if(c.get(Calendar.DAY_OF_WEEK) == 1){  
  dayForWeek = 7;  
 }else{  
  dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1;  
 }  
 return dayForWeek;  
}