按月获取星期数

Question

我想获取每年的星期数。这段代码有错误的结果：

for (int i = 0; i <= 11; i++) {
    Calendar cal = Calendar.getInstance(Locale.FRANCE);
    cal.set(this.anneeActuelle, i, 1);
    nombreMaxSemaine = cal.getActualMaximum(Calendar.WEEK_OF_MONTH);
}

Answer 1

在Java 8+中，您可以像这样使用YearMonth轻松获得每月的周数：

YearMonth.of(2019, Month.JULY).atEndOfMonth().get(WeekFields.ISO.weekOfMonth())

应避免使用旧式Calendar类（由Java 8中新的Date / Time Api代替）

Answer 2

OP希望在 MONTH 中获得最长的周数。 您可以像this

那样做

import java.util.Calendar;
import java.util.Locale;
public class App {
    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        if(calendar.isWeekDateSupported()) {
            Calendar cal = Calendar.getInstance(Locale.FRANCE);
            for (int i = 0; i <= 11; i++) {
                int nombreMaxSemaine = cal.getActualMaximum(Calendar.WEEK_OF_MONTH);
                System.out.println("Current week number: " + nombreMaxSemaine);
            }
        }
    }
}

输出：

Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4
Current week number: 4