Java Caledar类(日历类)如何判断本周周数

public static void main(String[] args) throws Exception{
        //格式化时间
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        //新建日历类
        Calendar c=Calendar.getInstance();
        //设置周一为第一天
        c.setFirstDayOfWeek(Calendar.MONDAY);
        //新建格式化今天的String类日期
        String todayStr=sdf.format(new Date());
        //转为Date类型
        Date today=sdf.parse(todayStr);
        //设置日历时间
        c.setTime(today);
        //获取当前周数
        int currentWeekNum=c.get(Calendar.WEEK_OF_YEAR);
        System.out.println(currentWeekNum);
        //要查询的日期
        String str="2022-3-28";
        Date date=sdf.parse(str);
        c.setTime(date);
        //查询日期的周数
        int selWeekNum=c.get(Calendar.WEEK_OF_YEAR);
        System.out.println(selWeekNum);
        if(currentWeekNum==selWeekNum){
            System.out.println(str+"是当前周的日期");
        }else{
            System.out.println(str+"不是当前周的日期");
        }

    }

Calendar calendar = Calendar.getInstance();

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.YEAR, 2023);

int week = calendar.getWeeksInWeekYear();

calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);

```java
>//创建对象                
>Calendar calendar = Calendar.getInstance();
>// 设置年份
>calendar.set(Calendar.YEAR,2023);
>// 设置,比如 获取周一的日期
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        // 一年中的第几周
        calendar.set(Calendar.WEEK_OF_YEAR,36);
        // 获得月份。需要+1.因为月份是从0开始的
        int i = calendar.get((Calendar.MONTH))+1;
        System.out.println(i);
        // 获得那一周，周一的日期
        System.out.println(calendar.get(Calendar.DAY_OF_MONTH));