Question

我正在编写的代码会在用户输入文本文件时从文本文件中删除一个单词，但我似乎无法让扫描仪部分工作

public static void Option2Method() throws IOException 
{

File inputFile = new File("wordlist.txt");
File tempFile = new File("TempWordlist.txt");
String lineToRemove = JOptionPane.showInputDialog(null, "Enter a word to remove");
Scanner reader =  new Scanner(inputFile); 
Scanner writer =new Scanner(tempFile);
String currentLine;

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

Answer 1

Scanner不是为了写文件，因此没有write()方法。您可以改用BufferedWriter。

示例：

public static void Option2Method() throws IOException {

    File inputFile = new File("wordlist.txt");
    FileWriter fstream = new FileWriter("TempWordlist.txt", true);
    BufferedWriter writer = new BufferedWriter(fstream);

    File tempFile = new File("TempWordlist.txt");
    String lineToRemove = JOptionPane.showInputDialog(null, "Enter a word to remove");
    Scanner reader = new Scanner(inputFile);

    while (reader.hasNextLine()) {
        String trimmedLine = reader.nextLine().trim();
        if (trimmedLine.equals(lineToRemove))
            continue;

        writer.write(trimmedLine + "\n");
    }

    reader.close();
    writer.close();
    inputFile.delete();
    tempFile.renameTo(inputFile);
}

使用PrintWriter：

    File inputFile = new File("wordlist.txt");
    PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter("TempWordlist.txt", true)));

    File tempFile = new File("TempWordlist.txt");
    String lineToRemove = JOptionPane.showInputDialog(null, "Enter a word to remove");
    Scanner reader = new Scanner(inputFile);

    while (reader.hasNextLine()) {
        String trimmedLine = reader.nextLine().trim();
        if (trimmedLine.equals(lineToRemove))
            continue;

        writer.print(trimmedLine + "\n");
    }

    reader.close();
    writer.close();
    inputFile.delete();
    tempFile.renameTo(inputFile);

Answer 2

Scanner没有print方法。它用于扫描文件，读取数据。

如果您要撰写文件，请使用this或that或仅使用Google +＆＃34; java write to file＆＃34;

文本文件错误扫描程序

2 个答案: