用Calendar定时

Question

 Calendar calendar = Calendar.getInstance();//使用默认时区和语言环境获得一个日历
        // 创建Calendar对象
        Calendar cal = Calendar.getInstance();
        // 设置年
        int year = cal.get(Calendar.YEAR);
        // 设置月
        int month = cal.get(Calendar.MONTH) + 1;
        // 设置日
        int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
        int hour = cal.get(Calendar.HOUR);
        int minute = cal.get(Calendar.MINUTE);
        System.out.print(year + "年" + month + "月" + dayOfMonth + "日" + hour + "点" + minute + "分");
        while (true) {
            if ((year == 2022) && (month == 12) && (dayOfMonth == 23)
                    && (hour == 2) && (minute == 16)) {
                System.out.println("女朋友生日快乐");
                break;
            }

用Calendar定时导致无限循环

Answer 1

你的这个cal定义要放到while里面，不然会一直是同一个值，这边改了一版，加了个sleep，并且改成了24小时制，你可以参考下

        while (true) {
            // 创建Calendar对象
            Calendar cal = Calendar.getInstance();
            // 设置年
            int year = cal.get(Calendar.YEAR);
            // 设置月
            int month = cal.get(Calendar.MONTH) + 1;
            // 设置日
            int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
            int hourOfDay = cal.get(Calendar.HOUR_OF_DAY);
            int minute = cal.get(Calendar.MINUTE);
            System.out.println(year + "年" + month + "月" + dayOfMonth + "日" + hourOfDay + "点" + minute + "分");

            if ((year == 2022) && (month == 12) && (dayOfMonth == 23)
                    && (hourOfDay == 16) && (minute == 10)) {
                System.out.println("女朋友生日快乐");
                break;
            }

            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }