java - MACD java 双数组

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，但它应该继续向下循环。导入该行后，我需要将其转换为 double 。我的问题是如何将整个文件导入到字符串数组中，然后将其转换为 double，然后使用 for 循环循环遍历 double 数组，以通过给定的方程计算 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 - 将添加到价格 List 的 for 循环替换为从 csv 读取收盘价的 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;
    }
}