I am having a file called customersinfo.txt this is how my file structure looks like

ID FirstName LastName Email Mobile UserName PassWord ConPassWord 1 John Sam JS@gmail.com 0123 JhonSam12 1234 1234 2 ---- ------ ----------- ---- ----- ------ -------

So my problem is it accepts multiple users with the same username what I want is to check when the customer enters his username whether if that username already exists in the file or not if that username already exists try to enter a different username if not accept and save it to the file

What I have tried:

 

package sample;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import javax.swing.*;
import java.io.*;
import java.nio.file.Files;
import java.util.Collection;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Read
{
public void display ()
{
String filepath = "customersAllInfo.txt";
String editTerm = "343";
String newFirstName = "1";
String newLastName = "1";
String newEmailID = "1";
String newMobile = "1";
String newPassword = "1";
String newPasswordCon = "1";

CreatNewUser(filepath,newFirstName,newLastName,newEmailID,newMobile,editTerm,newPassword,newPasswordCon);
}

private static Scanner x;

public void CreatNewUser (String filepath,String newFirstName,String newLastName,String newEmailID,String newMobile,String editTerm,String newPassword,String newPasswordCon)
{
boolean found = false;
File newCustomer = new File("customersAllInfo.txt");
File oldFile = new File(filepath);
String IDF1 = ""; String saveFname1 = ""; String saveLname1 = ""; String saveEmail1 = ""; String saveMobile1 = ""; String saveUser1 = "";
String saveFpass1 = ""; String saveLpass1 = "";
try
{
x = new Scanner(new File(filepath));
x.useDelimiter("[,\n]");

while (x.hasNext() && !found)
{
IDF1 = x.next();
saveFname1 = x.next();
saveLname1 = x.next();
saveEmail1 = x.next();
saveMobile1 = x.next();
saveUser1 = x.next();
saveFpass1 = x.next();
saveLpass1 = x.next();

if (saveUser1.trim().equals(editTerm.trim()))
{
//found = true;
System.out.println("Already Exists");
found = true;
}

else
{
newCustomer = new File("customersAllInfo.txt");
try
{
newCustomer.createNewFile();
}
catch (IOException ex)
{
System.out.println("customersAllInfo FILE COULDN'T BE CREATED");
}

try
{
BufferedWriter a = new BufferedWriter(new FileWriter(newCustomer,true));
a.write( newFirstName + "," + newLastName + "," + newEmailID + "," + newMobile + editTerm + "," + newMobile + "," + newPassword + "," + newPasswordCon + "\n");
a.close();
System.out.println("DONE");
}
catch (IOException ex)
{
System.out.println("ERROR IN ENTERING THE INFORMATION");
}

}
}
x.close();
}
catch (Exception e)
{
System.out.println("ERROR ERROR TO FIND FILE");
}

}
}