MACD java Double array

Question

我对如何实现福特收盘价的导入有点困惑。目前，我正在使用扫描仪，虽然有下一行，它应该继续循环下来。导入行后，我需要将其转换为双精度。我的问题是如何将整个文件导入字符串数组，然后将其转换为双精度，然后使用for循环通过双精度数组来计算给定方程的MACD。

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class ImportCSV
{
public static void main(String[] args)
{
  //to import .csv file
  String fileName = "Ford.csv";
  File file = new File(fileName);
  try
  {
     Scanner inputStream = new Scanner(file);
     //ignore the first line
     inputStream.next();
     while (inputStream.hasNext())
     {
        //get the whole line
        String data = inputStream.next();
        //split the string into an array of strings
        String [] values = data.split(",");
        //convert to double
        double closingPrice = Double.parseDouble(values[4]);
       // System.out.println(closingPrice);
        final double EMA_12_AlPHA = 2.0 / (1 + 12);
        final double EMA_26_AlPHA = 2.0 / (1 + 26);
        double ema12 = 0;
        double ema26 = 0;
        double macd = 0;

           ema12 = EMA_12_AlPHA * closingPrice + (1 - EMA_12_AlPHA) * ema12;
           ema26 = EMA_26_AlPHA * closingPrice + (1 - EMA_26_AlPHA) * ema26;
           macd = ema12 - ema26;
           System.out.println(macd);

     }
     inputStream.close();
  }
  catch (FileNotFoundException e)
  {
     // TODO Auto-generated catch block
     e.printStackTrace();
  }

}}

Answer 1

为简洁起见，省略了文件读取代码—将添加价格List的for循环替换为读取csv收盘价的while循环。

import java.util.*;
public class Macd {
    private static List<Double> prices;
    private final static double EMA_12_AlPHA = 2d / (1d + 12d);
    private final static double EMA_26_AlPHA = 2d / (1d + 26d);
    public static void main(String []args){
        prices = new ArrayList<Double>();
        for(int i=0; i<100; i++) {
            prices.add(new Double(i));
        }
        for(int i = 25; i < prices.size(); i++) {
            final double macd = getEma12(i) - getEma26(i);
            System.out.println(macd);
        }
    }
    public static double getEma12(int day) {
        if(day < 11)
            System.err.println("Day must be >= 11");
        double ema12 = 0d;
        for(int i=day-10; i<=day; i++) {
            ema12 = EMA_12_AlPHA * prices.get(i) + (1d - EMA_12_AlPHA) * ema12;
        }
        return ema12;
    }
    public static double getEma26(int day) {
        if(day < 25)
            System.err.println("Day must be >= 25");
        double ema26 = 0d;
        for(int i=day-24; i<=day; i++) {
            ema26 = EMA_26_AlPHA * prices.get(i) + (1d - EMA_26_AlPHA) * ema26;
        }
        return ema26;
    }
}