Java determines what day of the week a specified date is

To get the day of the week for a specified date, you can use the following two methods to get the day of the week:

1. Use the Calendar class

//根据日期取得星期几
	public static String getWeek(Date date){
		String[] weeks = {"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int week_index = cal.get(Calendar.DAY_OF_WEEK) - 1;
		if(week_index<0){
			week_index = 0;
		} 
		return weeks[week_index];
	}

2. Use the SimpleDateFormat class

//根据日期取得星期几
	public static String getWeek(Date date){ 
		SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
		String week = sdf.format(date);
		return week;
	}

Note: The format string is case-sensitive

For the parameters passed in when creating SimpleDateFormat: EEEE represents the day of the week, Such as "Thursday"; MMMM represents the Chinese month, such as "November"; MM represents the month, such as "11";

yyyy represents the year, such as "2010"; dd represents the day, such as "25"

For more java knowledge, please pay attention to java basic tutorial.

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