Java PrintWriter 不工作 [英] Java PrintWriter not working

问题描述

我只是想将我的二维数组拼图"写入文件.我有一个双 for 循环，它读取数组中的每个char"值，并将它们写入文件.我似乎无法在我的代码中找到错误.该文件说它在我运行程序时被修改，但它仍然是空白的.谢谢各位！

I am simply trying to write my 2d array "puzzle" to a file. I have a double for loop which reads through each of the 'char' values in my array and supposedly writes them to the file. I can't seem to find the error in my code. The file says it is modified when I run the program, but it is still blank. Thanks guys!

    public void writeToFile(String fileName)
{
try{
    PrintWriter pW = new PrintWriter(new File(fileName));
    for(int x = 0; x < 25; x++)
    {
        for(int y = 0; y < 25; y++)
        {
            pW.write(puzzle[x][y]);
        }
        pW.println();
    }
  }
  catch(IOException e)
  {
    System.err.println("error is: "+e.getMessage());
  }
}

推荐答案

在 finally 块中关闭 PrintWriter 以刷新它并回收资源

Close your PrintWriter in a finally block to flush it and to reclaim resources

public void writeToFile(String fileName) {

  // **** Note that pW must be declared before the try block
  PrintWriter pW = null;
  try {
     pW = new PrintWriter(new File(fileName));
     for (int x = 0; x < 25; x++) {
        for (int y = 0; y < 25; y++) {
           pW.write(puzzle[x][y]);
        }
        pW.println();
     }
  } catch (IOException e) {
     // System.err.println("error is: "+e.getMessage());
     e.printStackTrace();  // *** this is more informative ***
  } finally {
     if (pW != null) {
        pW.close(); // **** closing it flushes it and reclaims resources ****
     }
  }
}

警告:代码未经测试或编译.

Caveat: Code not tested nor compiled.

请注意，另一种选择是使用尝试使用资源.

Note that another option is to use try with resources.

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