Question

我正在编写此代码以从文本文件中删除单词，但似乎无法使扫描程序正常工作。它适用于bufferedreader，但我不允许使用它。我在这做错了什么？

    public static void Option2Method(String dictionary) throws IOException 
{

    File inputFile = new File(dictionary);
    File tempFile = new File("TempDict.txt");
    String tempword = JOptionPane.showInputDialog(null, "Enter a word to remove");
    String lineToRemove = tempword.toLowerCase();
    lineToRemove = lineToRemove.replaceAll(",", "");
    lineToRemove = lineToRemove.replaceAll("\\.", "");
    lineToRemove = lineToRemove.replaceAll("\\?", "");
    lineToRemove = lineToRemove.replaceAll(" ", "");

    Scanner reader = new Scanner(new File(inputFile));
    FileWriter writer = new FileWriter(tempFile);
    String currentLine;

    while((currentLine = reader.hasNext()) != null)
    {
        String trimmedLine = currentLine.trim();
        if(trimmedLine.equals(lineToRemove)) continue;
        writer.write(currentLine + "\n");
    }
    reader.close();
    writer.close();
    inputFile.delete();
    tempFile.renameTo(inputFile);
}

Answer 1

while((currentLine = reader.next()) != null)

使用next()代替hasNext()。

hasNext() - 这只会说明输入中是否还有其他令牌。

next() - 这将从其输入中返回下一个完整的标记。

Answer 2

应该是

Scanner reader = new Scanner(new File(inputFile));
FileWriter writer = new FileWriter(tempFile);
while(reader.hasNextLine()) {
   String currentLine = reader.nextLine();
   ...

扫描仪不工作而不是缓冲读卡器

2 个答案: