How to prevent the file to overwrite itself?

Question

i've edited the code, can you please tell me how i can write each line at the end of the file? Here it's been written on the same line. Can you help please?

private void okMouseClicked(java.awt.event.MouseEvent evt) {                                
    String pass = name.getText();
    if (pass.equals("")){
        error.setText("Name of Entity should not be left blank");
        //JOptionPane.showMessageDialog(null,"Name of Entity should not be left blank");
    }
    else{
        try{

            Formatter outfile = new Formatter(new FileOutputStream("Convert.sql", true));
            outfile.format("Create Database IF NOT EXISTS " + pass + ";");
            outfile.close();

        }

        catch(FileNotFoundException fnfe){
            System.out.println("Not found");

        }
        this.dispose();
    }
}

The word you're looking for is 'overwrite', and SQL has nothing to do with it. Neither does Swing code. — user207421, Feb 09 '15 at 21:12

M A · Accepted Answer · 2015-02-09T19:29:43.557

0

You can pass to the constructor of Formatter a FileOutputStream created in append mode:

Formatter outfile = new Formatter(new FileOutputStream("Convert.sql", true));
outfile.format("Create Database IF NOT EXISTS " + pass + ";\n");  // \n to add new line

See http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#Formatter(java.io.OutputStream).

edited Feb 09 '15 at 19:29

answered Feb 09 '15 at 18:16

M A

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Thanks it worked @manouti. But How can i add each statement at the end of the file and not on the same line? – Lana Feb 09 '15 at 19:13
@LanaM Just add a newline (`\n`) character when writing: `outfile.format("Create Database IF NOT EXISTS " + pass + ";\n");` – M A Feb 09 '15 at 19:25

How to prevent the file to overwrite itself?

1 Answers1