一个简单的随机算法——生成随机时间

根据起始时间生成随机事件，代码如下：

    public static Date randomDate(Date beginDate,Date  endDate ){
        if(beginDate.getTime() >= endDate.getTime()){
            return new Date();
        }
        long date = random(beginDate.getTime(),endDate.getTime());
        return new Date(date);
    }
    public static long random(long begin,long end){
        long rtn = begin + (long)(Math.random() * (end - begin));
        if(rtn == begin || rtn == end){
            return random(begin,end);
        }
        return rtn;
    }