将字符串和2D数组写入.txt文件 - Java

问题描述

我正在尝试将单个字符串和2D数组输出到.txt文件中并遇到问题，这是我项目的最后一部分。该程序应该输出一行，逗号分隔，字符串，然后在下一行，打印出2D数组中的双打，逗号分隔。我想能够将此全部打印到.txt文件，然后在excel文件中打开该.txt文件以绘制信息图形。以下是我到目前为止所知道的错误可能比我看到的更多：

  public void writeFile（double [ ] [] array，String filename）
 {
 try {
 File f = new File（output.txt）; 
扫描仪扫描=新扫描仪（f）; 
 scan.useDelimiter（\\\\ *，\\ t *）; 
 String label =Algoritm-1，Algorithm-2，Algorithm-3，
 +n，n-squared，n-cubed; //只有一行打印此行
 
 for（int i = 0; i< = 18; i ++）
 {
 for（int j = 0; j< = 5; j ++）
 {
 array [i] [j] = scan.nextDouble（）; //当前发行
} 
 scan.nextLine（）; 
} 
} 
 catch（FileNotFoundException fnf）{
 System.out.println（fnf.getMessage（））; 
} 
} 
  

解决方案

它看起来你在输出文件上使用扫描仪。扫描仪通常用于读取输入文件。打开一个新的输出文件并将该数组打印到该文件。

查找OutputStreamWriter的示例。这里有一个：

建议：您可以使用数组维度的长度来代替使用18和5作为循环吗？ / p>

I am trying to output a single string and 2D array into a .txt file and am running into issues and this is the last part of my project. The program should output a single line, comma-delimited, String, then on the next line, prints out the doubles within the 2D array, comma-delimited. I am suppose to be able to print this all to the .txt file and then open that .txt file in a excel file to graph the information. Here is what I have thus far and I understand there may be more errors than I may see:

 public void writeFile(double[][] array, String filename)
  {
     try{
        File f = new File("output.txt");
        Scanner scan = new Scanner(f);
        scan.useDelimiter("\\s*,\\s*");
        String label = "Algoritm-1, Algorithm-2, Algorithm-3, "
           + "n, n-squared, n-cubed"; //Only one printing of this line

        for (int i = 0; i <= 18; i++)
        {
           for (int j = 0; j <= 5; j++)
           {
              array[i][j] = scan.nextDouble(); //Having the current issue
           }
           scan.nextLine();
        }
     }
        catch (FileNotFoundException fnf) {
           System.out.println(fnf.getMessage());
        }
  }

解决方案

It looks like you are using a scanner on your output file. The scanner is generally used to read input files. Open a new output file and print the array to that file.

Look for an example of OutputStreamWriter. There's one here:http://www.javapractices.com/topic/TopicAction.do?Id=42

Suggestion: Instead of using 18 and 5 for your loops, can you use the lengths of the array dimensions?

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