A customer has a system that captures data from a serial stream supplying data from a conveyor belt machine. This conveyor machine has its own hardware module to calculate its weight accumulated over time. It is a total weight reading (in lbs) that is sent out continuously on a serial port. The weight cannot be reset on the machine and will continuously increase as the conveyor operates. The client is going to build a component that reads this serial data and passes the same data to a new application for display purposes. You will have to build a data simulator in your application that simulates the data that will be sent to you. It will have the following parameters passed in:
• Timestamp of the data
• Current total weight value as a double
• Status message as a string to indicate the equipment state兄弟不明白这三个参数有什么用。我觉得起一个线程产生double随机数不就行了嘛。望高人指点。谢谢了
• Timestamp of the data
• Current total weight value as a double
• Status message as a string to indicate the equipment state兄弟不明白这三个参数有什么用。我觉得起一个线程产生double随机数不就行了嘛。望高人指点。谢谢了
起个thread，每隔一定的时间给double的sum值累加。累加上去的值是随机的。时间间隔也可以是random的
• Current total weight value as a double//“The client is going to build a component that reads this serial data and passes the same data to a new application for display purposes.”知道现在的weight，client才能读取它，并且传递它。
• Status message as a string to indicate the equipment state//线程必须有的状态信息，状态有等待，终止，运行，睡眠，唤醒。
continuously increase as the conveyor operates data是一直增长的
private long timeStamp = 0;
private double currentTotalWeight = 0.0;
private String status = null;
private Random random = null;
private int seed = 0;
private double item = 0;
private int sleepSecs = 0;
public void run() {
random = new Random(timeStamp);
seed = random.nextInt();
item = (Math.abs(seed % 100) + 1);
long count = 10;//00000;
sleepSecs = (int) Math.abs(seed % 60 + 1);
// double sum = 0;
for(int i = 0; i < count; i++)
// while(resetFlag)
{
random = new Random(System.currentTimeMillis());
// Random random2 = new Random(System.currentTimeMillis());
seed = random.nextInt();
// int seed2 = random.nextInt();
item = (Math.abs(seed % 100) + 1);
sleepSecs = Math.abs(seed % 5000 + 1);
currentTotalWeight += item;
System.out.println("loop: " + i + "\t seed :" + seed +
"\tweight of item : " + item +
"\tsum of the item:" + currentTotalWeight +
"\tsleep time is:" + sleepSecs);
try {
Thread.sleep(sleepSecs);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
// System.out.println("weight of item : " + item);
System.out.println("sum of the item:" + currentTotalWeight);
}
}各位兄弟说说我的这个方案怎么样？ 但是我不能用那三个所要求参数。给点意见吧。
一个是产生data，一个是接受和打印data，你再仔细看看英文，不要把问题想的太复杂，建个uml理解下，把名词都看成对象就行了，根据对象建类。
你再仔细想想，实在不会我再给你写代码。
1. 每一次reset后的总重量。
2. 迄今为止移动的lbs/second.一直增长的问题我觉得只要不停的把产生的随机数求和就行了。
这位兄弟的话有道理，我想data做一个类，包括
• Timestamp of the data
• Current total weight value as a double
• Status message as a string to indicate the equipment state
这三个属性；simulator做一个类，这后一类主要模拟serial port。目前就这麽简单。其他的请指导。
有水平。我们想象超市的收银台，传过来的物品重量是不一样的，这就是我为什么要用random函数。我目前搞不懂为什么要那三个参数。
现在你要做的是吧这个过程写成算法，和实际问题没什么关系吧，是让你把众多实际问题抽象出来些出算法。
• Timestamp of the data
• Current total weight value as a double
• Status message as a string to indicate the equipment state比如第一个参数，数据的timestamp，某些业务逻辑的应用中会用到这个时间戳，因为需要知道哪个重量阶段是生成于哪个时间阶段第三个参数，设备状态信息，设备是否运转完好，稳定，当前状态值如何等可能会对某些延伸应用具参考意义
能说的具体点吗？我用random生成一个随机的放置到传送带上的物品重量，比如random(System.currentTimeMillSeconds);那么这个时间戳是不是就是System.currentTimeMillSeconds这个值？
• Timestamp of the data 时间戳，用来计算累加的重量
• Current total weight value as a double 当前重量
• Status message as a string to indicate the equipment state 状态标识而要显示的重量为当前重量加上增量。增量的计算就与时间有关系了，我觉得应该用一个变量保存上次的时间戳，两次时间戳之差再乘以一个参数即可作为增量。如果是第一次传递，即上次时间戳为0，则增量为0.第三个参数姑且用来显示用吧，或者作为一个线程结束的标志。