Question

this is the code i use when opening the txt file but it overwrites the data everytime i want to put in more data.

private  Formatter X;
    private File Y = new File("C:\\Users\\user\\workspace\\Property Charge Management System\\users.txt");
    private Scanner Z;
    public  String[][] PCMSarray;
    public boolean OpenFile() {
        try{
            if(Y.exists()==false){
                X = new Formatter("users.txt");
            }
            return true;
        }
        catch(Exception e){
            System.out.println("File has not yet been created.");
            return false;
        }
    }

This is the code i use to write to the file but this works.

public void WriteToFilecmd(){
        Scanner input = new Scanner(System.in);
        System.out.println("Please enter your First name");
        String Fname = input.next();
        System.out.println("Please enter your Last name");
        String Lname = input.next();
        System.out.println("Please enter your Password");
        String Password = input.next();
        System.out.println("Please enter your user ID");
        String ID = input.next();
        System.out.println("Please enter the first address line of your Property");
        String addressln1 = input.next();
        System.out.println("Please enter the second address line of your Property");
        String addressln2 = input.next();
        System.out.println("Please enter the third address line of your Property");
        String addressln3 = input.next();
        System.out.println("Please enter the properties estimated market value");
        String EstimatedPropertyValue = input.next();
        System.out.println("Please enter your tax owed");
        String Taxowed = input.next();
        input.close();

        X.format("%1$20s %2$20s %3$20s %4$20s %5$20s %6$20s %7$20s %8$20s %9$20s \n",Fname,Lname,Password,ID,addressln1,addressln2,addressln3,EstimatedPropertyValue,Taxowed);
    }

Answer 1

Use a different constructor for the Formatter, one that takes a FileWriter (which is Appendable), and construct the FileWriter so that it appends to the end of the file:

// the second boolean parameter, true, marks the file for appending
FileWriter fileWriter = new FileWriter(fileName, true); 
Formatter formatter = new Formatter(fileWriter);

As an aside, please learn and follow Java naming rules, else your code will not be easily understood by others (namely us!). Variable and method names should begin with lower-case letters.