java 周几_java根据年月日判断周几

灰太狼 2022-11-01 13:57 222阅读 0赞

java根据年月日判断周几，下面提供四中方法需要的可以参考下.

方法一:

public static String dateToWeek(String datetime) throws java.text.ParseException \{

SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");

String\[\] weekDays = \{ "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(); // 获得一个日历

Date datet = null;

datet = (Date) f.parse(datetime);

cal.setTime(datet);

int w = cal.get(Calendar.DAY\_OF\_WEEK) - 1; // 指示一个星期中的某天。

if (w < 0)

w = 0;

System.out.println(weekDays\[w\]);//星期二

return weekDays\[w\];

public static void main(String\[\] args) throws java.text.ParseException \{

System.out.println(Ts.dateToWeek("2019-01-01"));

方法二:

//基姆拉尔森计算公式根据日期判断星期几

public static void CalculateWeekDay(int y, int m, int d) \{

if(m < 1 || m >12)\{

System.out.println("你输入的月份不再范围内，请重新输入！");

if (m == 1 || m == 2) \{

m += 12;

y--;

int iWeek = (d + 2 \* m + 3 \* (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7;

switch (iWeek) \{

case 0:

System.out.printf("星期一\\n");

break;

case 1:

System.out.printf("星期二\\n");

break;

case 2:

System.out.printf("星期三\\n");

break;

case 3:

System.out.printf("星期四\\n");

break;

case 4:

System.out.printf("星期五\\n");

break;

case 5:

System.out.printf("星期六\\n");

break;

case 6:

System.out.printf("星期日\\n");

break;

public static void main(String args\[\]) \{

CalculateWeekDay(2019, 1, 8);

方法三：

public static int dayForWeek(String pTime) throws Exception \{

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

Calendar c = Calendar.getInstance();

c.setTime(format.parse(pTime));

int dayForWeek = 0;

if(c.get(Calendar.DAY\_OF\_WEEK) == 1)\{

dayForWeek = 7;

\}else\{

dayForWeek = c.get(Calendar.DAY\_OF\_WEEK) - 1;

System.out.println(dayForWeek);

return dayForWeek;

方法四：

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;

System.out.println(weeks\[week\_index\]);

return weeks\[week\_index\];

public static void main(String\[\] args) throws Exception \{

Ts.getWeek(new Date());

每天积累一点点，总用天会有发光的，加油！！！！

java 周几_java根据年月日判断周几

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