How to change the text in notepad

Question

I am newbie in the java programming. Here I got a question since I don't know how to change the text in the text file. How to change the String pass in notepad. I am trying to insert a new password in password field which in order to change(pass) that is password in my text file.

public void actionPerformed(ActionEvent e) {

    String inputUser = input1.getText();
    String inputPass = input2.getText();
    File loginf = new File("oop.txt");

    if(e.getSource() == returnLP) {
        TrialGUI link = new TrialGUI();
        dispose();
    }

    try {       
        if(e.getSource()==reset) {     
               FileWriter fstream = new FileWriter("oop.txt");
               BufferedWriter out = new BufferedWriter(fstream);
               Scanner read = new Scanner(new File("oop.txt"));

               while(read.hasNext()) {
                   String user = read.next();
                   String pass = read.next();

                   if(inputUser.equals(user)){                     
                      break;
                   }
               }

               read.close();
         } catch(Exception e) {
               e.printStackTrace();
         }
}

Your code is unclear; To help you write in a file check this [Link](http://stackoverflow.com/questions/2885173/java-how-to-create-and-write-to-a-file) — Hichamov, Dec 11 '14 at 15:37
Are you really asking us how to use your text editor? You open the file, you edit it, and then file->save. — Elliott Frisch, Dec 11 '14 at 15:38
@Hichamov Read http://stackoverflow.com/help/privileges to know why — Charlie, Dec 11 '14 at 15:44

Alan Hay · Accepted Answer · 2014-12-11T16:08:55.503

If you have a file of the format:

name=abc

password=xyz

then I would suggest that you may find loading the file to a java.util.Properties instance easier to work with.

Once loaded you can simply update any properties as required and then write back out your Properties instance once finished.

There are complete code samples here on how to read and write properties files.

http://www.mkyong.com/java/java-properties-file-examples/

Your code will look something like:

if(e.getSource() == reset) {    
    Properties props = new Properties();
    InputStream in = new  FileInputStream("oop.txt")
    props.load(in);
    in.close();

    //you can now access existing user name and password using proper.getProperty(key);

    //update to new details
    props.setProperty("user", inputUser);
    props.setProperty("password", inputPass);

    OutputStream out = new FileOutputStream("oop.txt");
    props.store(out, null);
    out.flush();
    out.close();

 }

How to change the text in notepad

1 Answers1