Java如何显示一年的周数？

在Java中，如何查找一年中或一个月中的第几个星期？

以下示例显示年份和月份的第几周。

package com.yiibai; import java.util.*; public class DisplayWeekNumber { 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"); } } 

Java

上述代码示例将产生以下结果。

today is 3 week of the year
today is a 5month of the year
today is a 4week of the month

Shell

示例-2
以下是一年中的一个月的一个例子。

package com.yiibai; import java.util.Calendar; public class DisplayWeekNumber2 { 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)); } } 

Java

上述代码示例将产生以下结果。

Current week of month is : 4
Current week of year is : 38
date after one year : 9-24-2017