Im new to java and I need a little help.
I store the usernema, password and name in user.dat file. The user enters his usernema and password , if its a match it prints his name on the screen. If its not a match the user is asked to register-add username , password and name to the file.
File content is:
user1 pass1 Tom
user2 pass2 Bob
user3 pass3 Ben
I have a code that kind of works.I cant figure out the part when ther isnt a match. Im sure im doing the file scan the best way.
If I use else the addUser() will run 2 times if is there a match and 3 times if there isnt one.
Any help will be appreciated!
import java.io.*;
import java.util.Scanner;
public class test {
public static void main(String[] args) throws FileNotFoundException {
Scanner console = new Scanner(System.in);
System.out.print("Enter username:");
String uname = console.next();
System.out.print("Enter password:");
String pw = console.next();
try {
FileInputStream fstream = new FileInputStream("C:/user.dat");
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String temp;
while ((temp = br.readLine()) != null) {
String[] splitted = temp.split(" ");
if (uname.equals(splitted[0])&&pw.equals(splitted[1])){
System.out.println("Welcome "+splitted[2]+" !");
break;
}
}
//no match run addUser()
in.close();
} catch (Exception e) {
System.err.println(e);
}
}
}
And for adding new users :
static void addUser(){
String new_uname=null;
String new_pw=null;
String new_name=null;
String choise=null;
Scanner console = new Scanner(System.in);
System.out.print("Do you want to register? y/n:");
choise = console.next();
while (!(choise.equalsIgnoreCase("y")||choise.equalsIgnoreCase("n"))){
System.out.print("Try again! y/n:");
choise = console.next();
}
if(choise.equals("y")){
System.out.print("Enter username:");
new_uname = console.next();
System.out.print("Enter password:");
new_pw = console.next();
System.out.print("Enter name:");
new_name = console.next();
try {
BufferedWriter out = new BufferedWriter(new FileWriter("C:/user.dat", true));
out.write(new_uname+" "+new_pw+" "+new_name);
System.out.print("Thanks for registering!");
out.close();
} catch (Exception e) {
System.err.println(e);
}
}
}
