Java Stock Viewer应用程序问题

Question

在过去的几个小时里，我一直试图找出这个股票查看器应用程序的问题。我昨天工作得非常好，今天进行了一些编辑，然后尝试将其恢复原状。现在，不是从StockClient（2016年1月7日到2017年1月7日）中列出的日期打印所有股票价格，而是从2月开始。请帮忙！

股票查看者类：

import java.util.*;
import java.net.URL;
import java.net.URLConnection;

public class StockViewer 
{
    private ArrayList<String> dates;
    private ArrayList<String> opens;
    private ArrayList<String> highs;
    private ArrayList<String> lows;
    private ArrayList<String> closes;
    private ArrayList<String> volumes;
    private ArrayList<String> adjCloses;
    private String sym;
    private boolean success = false;

public StockViewer(String symbol)
{   
    dates = new ArrayList<String>();
    opens = new ArrayList<String>(); 
    highs = new ArrayList<String>(); 
    lows = new ArrayList<String>(); 
    closes = new ArrayList<String>(); 
    volumes = new ArrayList<String>(); 
    adjCloses = new ArrayList<String>();

    sym = symbol;
}

public void viewStock(GregorianCalendar begin, GregorianCalendar fin)
{
    while(!success)
    {
        String url = "http://chart.finance.yahoo.com/table.csv?s=" + sym + 
                "&a=" + begin.get(Calendar.MONTH) + 
                "&b=" + begin.get(Calendar.DAY_OF_MONTH) + 
                "&c=" + begin.get(Calendar.YEAR) + 
                "&d=" + fin.get(Calendar.MONTH) + 
                "&e=" + fin.get(Calendar.DAY_OF_MONTH) +
                "&f=" + fin.get(Calendar.YEAR) + 
                "&g=d&ignore=.csv";
        try
        {
            URL yhooFin = new URL(url);
            URLConnection data = yhooFin.openConnection();
            Scanner input = new Scanner(data.getInputStream());
            if(input.hasNext()) // skip a line (that's the header)
                input.nextLine();
            // start reading data
            while(input.hasNextLine())
            {
                String line = input.nextLine();
                String[] elements = line.split(",");
                success = true;
                dates.add(elements[0]);
                opens.add(elements[1]);
                highs.add(elements[2]);
                lows.add(elements[3]);
                closes.add(elements[4]);
                volumes.add(elements[5]);
                adjCloses.add(elements[6]);
                for(int count = 0; count < elements.length; count++)
                {
                    if(count < 6)
                        System.out.print(elements[count] + " - ");
                    else
                        System.out.print(elements[count] + "\n");
                }
            }
        }
        catch(Exception e)
        {}
    }
}

public void viewStockCurrent(GregorianCalendar c1, GregorianCalendar c2)
{
    viewStock(c1, c2);
}
}

股票客户类：

import java.util.*;

public class StockClient 
{

    public static void main(String[] args) 
    {
        Scanner scan = new Scanner(System.in);

        System.out.print("Please enter a stock symbol: ");
        String symbol = scan.next();

        StockViewer stock = new StockViewer(symbol);

        GregorianCalendar start = new GregorianCalendar(2016, 1, 7);
        GregorianCalendar end = new GregorianCalendar(2017, 1, 7);

        stock.viewStock(start, end);
    }

}

Answer 1

月份属性为零，

中的值错误

GregorianCalendar start = new GregorianCalendar(2016, 1, 7);
GregorianCalendar end = new GregorianCalendar(2017, 1, 7);

有关详细信息，请参阅Calendar.MONTH。

  

get和set的字段编号，表示月份。这是特定于日历的值。 格里高利和朱利安日历中一年中的第一个月是JANUARY，0 ;最后一个取决于一年中的月数。