Calendar类实现打印日历

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打印日历代码如下：

public static void main(String[] args) throws ParseException {
        String str = "2017-7-18";
        Date date = new SimpleDateFormat("yyyy-MM-dd").parse(str);

        //获取日历类 设置时间
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(date);

        int currentDay = calendar.get(Calendar.DAY_OF_MONTH);

        //解决  每个月有多少天
        int day_of_month = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);

        //解决  一号是星期几
        calendar.set(Calendar.DAY_OF_MONTH, 1);

        int day_of_week = calendar.get(Calendar.DAY_OF_WEEK);

        System.out.println("日\t一\t二\t三\t四\t五\t六");

        for (int i = 1; i < day_of_week; i++) {
            System.out.print("\t");
        }
        for (int i = 1; i <= day_of_month; i++) {

            if (currentDay == i) {
                System.out.print("*");
            }
            System.out.print(i + "\t");
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
            if (dayOfWeek == Calendar.SATURDAY) { //星期6换行
                System.out.println();
            }
            calendar.add(Calendar.DAY_OF_MONTH, 1);

        }

    }