Java生成2022年的工作日列表，看看哪天放假

先写一个工作日类型，成员是当天的日期和是否工作。

class WorkDay{
    Calendar calendar;
    boolean work;

    public WorkDay(Calendar calendar, boolean work) {
        this.calendar = calendar;
        this.work = work;
    }

    @Override
    public String toString() {
        return "WorkDay{" +
                "calendar=" + Main.get_string(calendar) +
                ", work=" + work +
                ", 星期" + (calendar.get(Calendar.DAY_OF_WEEK) - 1) +
                '}';
    }

    public Calendar getCalendar() {
        return calendar;
    }

    public void setCalendar(Calendar calendar) {
        this.calendar = calendar;
    }

    public boolean isWork() {
        return work;
    }

    public void setWork(boolean work) {
        this.work = work;
    }

    public String toJsonString(){
        return " {\"date\":\"" + Main.get_string(this.calendar) + "\", "+"\"work\":\""+ this.work +"\"}";
    }
}

然后随便写写就做完了。

public class Main {

    public static boolean isNaturalWork(Calendar calendar) {
        int num = calendar.get(Calendar.DAY_OF_WEEK);
        if(num == Calendar.SATURDAY || num == Calendar.SUNDAY) return false;
        return true;
    }

    public static String get_string(Calendar calendar){
        return (new SimpleDateFormat("yyyy-MM-dd")).format(calendar.getTime());
    }

    public static Map<String,Boolean> arrangeWorkDays(){

        Map<String,Boolean> res = new HashMap<>();

        //国务院小程序放假安排
        //false 不工作
        //true 工作
        res.put("2022-01-01",false);
        res.put("2022-01-02",false);
        res.put("2022-01-03",false);
        res.put("2022-01-29",true);
        res.put("2022-01-30",true);
        res.put("2022-01-31",false);

        res.put("2022-02-01",false);
        res.put("2022-02-02",false);
        res.put("2022-02-03",false);
        res.put("2022-02-04",false);
        res.put("2022-02-05",false);
        res.put("2022-02-06",false);

        res.put("2022-04-02",true);
        res.put("2022-04-03",false);
        res.put("2022-04-04",false);
        res.put("2022-04-05",false);
        res.put("2022-04-24",true);
        res.put("2022-04-30",false);

        res.put("2022-05-01",false);
        res.put("2022-05-02",false);
        res.put("2022-05-03",false);
        res.put("2022-05-04",false);
        res.put("2022-05-07",true);


        res.put("2022-06-03",false);
        res.put("2022-06-04",false);
        res.put("2022-06-05",false);

        res.put("2022-09-10",false);
        res.put("2022-09-11",false);
        res.put("2022-09-12",false);

        res.put("2022-10-01",false);
        res.put("2022-10-02",false);
        res.put("2022-10-03",false);
        res.put("2022-10-04",false);
        res.put("2022-10-05",false);
        res.put("2022-10-06",false);
        res.put("2022-10-07",false);
        res.put("2022-10-08",true);
        res.put("2022-10-09",true);

        return res;
    }

    public static void main(String[] args) {

        Calendar cal_start = new GregorianCalendar(2022,Calendar.JANUARY,1);


        Calendar cal_end = new GregorianCalendar(2023,Calendar.JANUARY,1);
        String str_end = get_string(cal_end);

        List<WorkDay> workDays = new ArrayList<>();
        Map<String,Boolean> arrangement = arrangeWorkDays();

        while(!get_string(cal_start).equals(str_end)){

            String dayString = get_string(cal_start);

            WorkDay w = new WorkDay((Calendar) cal_start.clone(),isNaturalWork(cal_start));

            if(arrangement.get(dayString) != null){
                w.setWork(arrangement.get(dayString));
                System.out.println(w.toJsonString());
            }

            workDays.add(w);

            cal_start.add(Calendar.DATE,1);
        }

        StringBuilder sb = new StringBuilder();
        sb.append("[");
        sb.append(workDays.get(0).toJsonString());
        for(int i = 1; i < workDays.size(); i++){
            WorkDay ww = workDays.get(i);
            sb.append(",");
            sb.append(ww.toJsonString());
        }
        sb.append("]");


        try {
            BufferedWriter out = new BufferedWriter (new OutputStreamWriter(new FileOutputStream("workdays.json"), "UTF-8"));
            out.write(sb.toString());
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

结果看看，输出了一个文件