佐达时间：获得第一/第二/最后一个月的星期日 [英] Joda-Time: Get first/second/last sunday of month

问题描述

  Calendar getNthOfMonth（int n， int day_of_week，int month，int year）{
 Calendar compareDate = Date（1，month，year）; 
 compareDate.set（DAY_OF_WEEK，day_of_week）; 
 compareDate.set（DAY_OF_WEEK_IN_MONTH，n）; 
 return compareDate; 
} 
 //用法
日历lastSundayOfNovember = getNthOfMonth（-1，SUNDAY，NOVEMBER，2012）
  

使用清晰优雅的方式=nofollow> Joda-Time ？

解决方案

  public class Time {
 public static void main（String [] args）{
 System.out.println（getNthOfMonth（DateTimeConstants.SUNDAY，DateTimeConstants.SEP，2012 ））; 
} 
 
 
 public static LocalDate getNthOfMonth（int day_of_week，int month，int year）{
 LocalDate date = new LocalDate（year，month，1）.dayOfMonth （）
 .withMaximumValue（）
 .dayOfWeek（）
 .setCopy（day_of_week）; 
 if（date.getMonthOfYear（）！= month）{
 return date.dayOfWeek（）。addToCopy（-7）; 
} 
返回日期; 
} 
} 
  

In plain Java, I have this code to get the last Sunday of the month.

Calendar getNthOfMonth(int n, int day_of_week, int month, int year) {
    Calendar compareDate = Date(1, month, year);
    compareDate.set(DAY_OF_WEEK, day_of_week);
    compareDate.set(DAY_OF_WEEK_IN_MONTH, n);
    return compareDate;
}
// Usage
Calendar lastSundayOfNovember = getNthOfMonth(-1, SUNDAY, NOVEMBER, 2012)

What is a clean and elegant way to achieve the same result using Joda-Time?

解决方案

public class Time {
public static void main(String[] args) {
    System.out.println(getNthOfMonth(DateTimeConstants.SUNDAY, DateTimeConstants.SEP, 2012));
}


public static LocalDate getNthOfMonth(int day_of_week, int month, int year) {
    LocalDate date = new LocalDate(year, month, 1).dayOfMonth()  
             .withMaximumValue()
             .dayOfWeek()
             .setCopy(day_of_week);
    if(date.getMonthOfYear() != month) {
        return date.dayOfWeek().addToCopy(-7);
    }
    return date;
}
}

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