Text File error Scanner

Question

I'm writing code which deletes a word out of a text file when the user inputs it but I cant seem to get the scanner part to work

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);
}

Keeps giving an error for writer.print(currentLine + "\n"); It says it cannot find symbol — , Apr 07 '13 at 10:51

Tiago · Accepted Answer · 2013-04-07T17:00:26.217

Scanner is not meant to write files, hence does not have a write() method. You can use BufferedWriterinstead.

Example:

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);
}

Using 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);

Well then is there a way to do it with PrintWriter?? – Apr 07 '13 at 13:28 — , Apr 07 '13 at 13:28
Yes. I've added it to the answer. – Tiago Apr 07 '13 at 17:00 — Tiago, Apr 07 '13 at 17:00

score 0 · Answer 2 · edited May 23 '17 at 12:13

0

Scanner doesn't have a print method. It is used to scan a file and read data from it.

If you want to write to a file, use this or that or just google "java write to file"

edited May 23 '17 at 12:13

Community

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answered Apr 07 '13 at 10:53

BobTheBuilder

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You dont need BufferedReader, you need BufferedWriter – BobTheBuilder Apr 07 '13 at 10:59

Text File error Scanner

2 Answers2