java 24小時 48小時的內的寫法

 

private Date calculateTime(String inTimes) {
    Calendar now = Calendar.getInstance();
    if ("1".equals(inTimes)) {
        // in 24 hour
        now.add(Calendar.DAY_OF_MONTH, -1);
    } else if ("2".equals(inTimes)) {
        // in 48 hour
        now.add(Calendar.DAY_OF_MONTH, -2);
    } else {
        return null;
    }
    return now.getTime();
}