/**
 * Date与String的互转用法，这里需要用到SimpleDateFormat
 */
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(currentTime);
Date date = formatter.parse(dateString);

/**
 * Date与Calendar之间的互转
 */
Calendar cal = Calendar.getInstance();
cal.setTime(new Date());
Date date1 = cal.getTime();

/**
 * 利用Calendar获取年、月、周、日、小时等时间域
 */
cal.get(Calendar.YEAR);
cal.get(Calendar.MONTH);
cal.get(Calendar.WEEK_OF_MONTH);
cal.get(Calendar.DAY_OF_MONTH);

/**
 * 对时间进行加减
 */
cal.add(Calendar.MONTH, 1);
System.out.println(cal.getTime());

Calendarcal = Calendar.getInstance();
cal.set(2016,08,01);
String[] strDays = new String[] { "SUNDAY", "MONDAY", "TUESDAY",
         "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY"
        };
System.out.println(strDays[cal.get(Calendar.DAY_OF_WEEK) - 1]);