Question

 /**
 * 5 points
 *
 * Return the price of the stock at the given date as a double. Each line
 * of the file contains 3 comma separated
 * values "date,price,volume" in the format "2016-03-23,106.129997,25703500" 
 * where the data is YYYY-MM-DD, the price
 * is given in USD and the volume is the number of shares traded throughout 
 * the day.
 *
 * Note: You don't have to interpret dates for this assignment and you can use 
 * the Sting's .equals method to 
 * compare dates whenever date comparisons are needed.
 * 
 * @param stockFileName The filename containing the prices for a stock for each 
 *                      day in 2016
 * @param date          The date to lookup given in YYYY-MM-DD format
 * @return The price of the stock represented in stockFileName on the given date
 */
public static double  getPrice(String stockFileName, String date) {
  try {
    BufferedReader br = new BufferedReader(new FileReader(stockFileName));
    String line = "";
    String unparsedFile = "";
    Double Price;
    while ((line = br.readLine()) != null) {
      String[] Ans = unparsedFile.split(",");
      for (String item : Ans){ 
        if(Ans[1].equals(date)){
          double aDouble = Double.parseDouble(Ans[2]);    
          return aDouble;
        }
      }
    }
    br.close();

  } catch (IOException ex) {
    System.out.println("Error"); 
  }
  return Ans;
}

我现在的代码将假设只将.csv文件的一列与date参数进行比较。如何使代码查找单个行然后将该行的[1]与date参数进行比较并返回该行的[2]？

Answer 1

我认为您的代码接近于（功能上）正确。您犯的错误是Java数组从零开始索引，而不是从一个索引。所以Ans[1]实际上是给你数组的第二个元素......而不是第一个元素。

解决方案：显而易见......假设你明白我刚才写的内容！

修复错误后，您应该修复样式问题：

始终以小写字母开头的变量名称。
使用4个空格作为缩进级别
if之后的一个空格。
)和{

如何比较两个.csv文件？

1 个答案: