I'm trying to make a program that removes all occurences of a specified string from a text file. I'm having trouble with tying in everything to make it work, so that the user is prompted to enter a string.

This is what I've got:

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class RemoverFrame extends JFrame
    private JLabel prompt; // label to prompt user to enter 
    private JLabel display; // label to display 
    private JTextField textEntered; // textfield to enter text

    // constructor sets up GUI
    public RemoverFrame()
        super("Text Removal");

    prompt = new JLabel("Enter text to remove:");
    textEntered = new JTextField(10); // textfield for text entered

    // register anonymous action listener
        new ActionListener() // anonymous inner class
            public void actionPerformed(ActionEvent e)
                        int texted = Integer.parseInt(textEntered.getText());
        } // end anonymous inner class
    ); // end call to addActionListener

    display = new JLabel("Text removed:");

    add(prompt, BorderLayout.NORTH); // north region
    add(textEntered, BorderLayout.CENTER); // center region
    add(display, BorderLayout.SOUTH); // south region
    } // end RemoverFrame constructor
} // end class RemoverFrame

Any help would be great!

import java.io.*;
import java.util.*;

public class MyRemover {
    private static String textEntered;
    public static void main(String[] args) throws Exception {
    // Check command line parameter usage
    /* if (args.length != 2) {
            "Usage: java MyRemover stringToBeRemoved sourceFile");
    } */

    // Check if the file exists
        String fileName = "myFile.txt";
    File sourceFile = new File(fileName);
    if (!sourceFile.exists()) {
        System.out.println("Source file " + fileName + " not exist");

    // Read text from the file and save it in a string builder
    Scanner input = new Scanner(sourceFile);
    StringBuilder sb = new StringBuilder();

    String lineSeparator = System.getProperty("line.separator");
    boolean firstLine =  true;
        String toBeRemove = textEntered;
    while (input.hasNext()) {
        String s1 = input.nextLine();
        String s2 = s1.replaceAll(toBeRemove, "");
        if (firstLine) {
            firstLine = false;
            sb.append(lineSeparator + s2);


    // Write back to the file
    PrintWriter output = new PrintWriter(sourceFile);

import javax.swing.JFrame;

public class Remover
    public static void main(String[] args)
        RemoverFrame removerFrame = new RemoverFrame();
        removerFrame.setSize(275, 100); // set frame size
        removerFrame.setVisible(true); // display frame
} // end class Remover 

Edited 1 Year Ago by kxjakkk

Having the input from the user, say they enter the word "test", and have it be removed from a specified file.

You get the input from the user, but you parse it as an int. Why is that?

You have code (lines 14 - 46) that remove a given string from a given file. You can re-package that code as a method, passing the string and the file name as parameters. You can test that using your old main method, or call it from the GUI when you have the user's input.

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