如何在 Java 中找到一年中的第几周和第几月

问题说明

如何在 Java 中找到一年中的第几周和第几月？

解决方案

以下示例显示一年中第几周和第几月。

import java.util.*;

public class Main {
   public static void main(String[] args) throws Exception {
      Date d1 = new Date();
      Calendar cl = Calendar. getInstance();
      cl.setTime(d1);
      
      System.out.println("today is " + cl.WEEK_OF_YEAR+ "week of the year");
      System.out.println("today is a "+cl.DAY_OF_MONTH + "month of the year");
      System.out.println("today is a "+cl.WEEK_OF_MONTH +"week of the month");
   }
}

结果

以上代码示例将产生以下结果。

today is 30 week of the year
today is a 5month of the year
today is a 4week of the month

以下显示了一年中第几周和第几月的另一个示例。

import java.util.Calendar;
 
public class GetWeekOfMonthAndYear {
   public static void main(String[] args) {
      Calendar cal = Calendar.getInstance();
      System.out.println("Current week of month is : " +cal.get(Calendar.WEEK_OF_MONTH));
      System.out.println("Current week of year is : " +cal.get(Calendar.WEEK_OF_YEAR));
      cal.add(Calendar.WEEK_OF_MONTH, 1);
      System.out.println(
         "date after one year : " + (cal.get(Calendar.MONTH) + 1)+ "-"+ cal.get(Calendar.DATE)+ "-"+ cal.get(Calendar.YEAR)); 
   }
}

以上代码示例将产生以下结果。

Current week of month is : 2
Current week of year is : 46
date after one year : 11-18-2016