Java 字符串日期获取星期几 - 完整示例代码

可以使用 Java 中的 SimpleDateFormat 类将字符串日期解析为 Date 对象，然后使用 Calendar 类获取星期几。

示例代码：

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Test {

    public static void main(String[] args) {
        String dateStr = '2022-10-01';
        SimpleDateFormat sdf = new SimpleDateFormat('yyyy-MM-dd');
        try {
            Date date = sdf.parse(dateStr);
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
            String[] weekDays = {'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'};
            System.out.println('The day of week is ' + weekDays[dayOfWeek - 1]);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

输出结果：

The day of week is Saturday