判断某1日期是星期几

判断某一日期是星期几。
public static String getStringDayOfWeek(Date date) {  
                String result = "";  
                if (null != date) {  
                    SimpleDateFormat formatter4 = new SimpleDateFormat("E");  
                   result = formatter4.format(date);  
              }  
               return result;  
           }