Summary of methods to determine the day of the week in java

Java method to get the day of the week for a specified date: (Related video tutorial recommendation: java video tutorial)

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];
	}

The value of the week number member variable SUNDAY-SATURDAY of the Calendar class is 1-7, and the start of the week is Sunday.

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"

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