java获取本周第一天的日期

public static Date getWeekStartDate(){

Calendar cal = Calendar.getInstance();

cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);

cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0);

Date date = cal.getTime();

return date;

}