java获得当月的双休日

可以使用Java的Calendar类来获取当月的所有日期，然后判断哪些日期是双休日。具体实现如下：

import java.util.Calendar;

public class Main {
    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH) + 1;
        int days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
        for (int i = 1; i <= days; i++) {
            calendar.set(year, month - 1, i);
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
            if (dayOfWeek == Calendar.SATURDAY || dayOfWeek == Calendar.SUNDAY) {
                System.out.println(year + "-" + month + "-" + i);
            }
        }
    }
}