Hello again fellow programmers. I have another problem that's puzzling me. I am trying to receive input from a user but always receive an "java.util.NoSuchElementException: No line found". I have tried all the methods I've searched with no luck. Here is my code:
import java.util.Scanner;
import java.io.*;
public class UserLog {
static String username;
static String password;
static String passcompare;
static File name;
static String Userfile = "username-";
static String Passfile = "password-";
public static void main(String[] args) {
menu();
}
public static void menu(){
boolean call = false;
try (Scanner in = new Scanner(System.in)) {
do {
System.out.println("Select an option: ");
System.out.println("1: New account \n"
+ "2: Existing account");
System.out.print("-");
int choice = in.nextInt();
in.nextLine();
switch(choice) {
case 1:
call = true;
System.out.println("\nNew account called\n");
userCreate();
break;
case 2:
call = true;
System.out.println("\nExisting account called\n");
login();
break;
default:
System.out.println("\nNot a valid option\n");
}
} while(!call);
in.close();
}
catch(Exception ex) {
System.out.println("Exception Text: " + ex);
}
}
static void login(){
try (Scanner in = new Scanner(System.in)) {
System.out.println("LOGIN SCREEN\n");
System.out.print("Username: ");
username = in.nextLine();
name = new File("user-" + username + ".txt");
if(name.exists()) {
System.out.println("Username exists");
System.out.print("Password: ");
password = in.nextLine();
//scans userfile for password
if(password.length() != 0 && password.length() >= 8 /* and password-username match */) {
System.out.println("Login successful");
in.close();
}
}
else {
System.out.println("Username doesn't exist in system");
System.out.println("Would you like to create this user? (y/n)");
System.out.print("-");
char choice = (char)System.in.read();
switch(choice) {
case 'Y':
case 'y':
System.out.println("Creating user " + username);
name = new File("user-" + username + ".txt");
name.createNewFile();
System.out.println("User created");
passCreate(name);
in.close();
break;
case 'N':
case 'n':
System.out.println("Denied creation of user");
in.close();
break;
default:
System.out.println();
}
}
in.close();
} catch (IOException ex) {
System.out.println("Exception Text: " + ex);
}
}
private static File nameCreate() {
try (Scanner user = new Scanner(System.in)) {
System.out.print("Enter Username: ");
username = user.nextLine();
name = new File("user-" + username + ".txt");
if(!name.exists()) {
name.createNewFile();
try (FileWriter fw = new FileWriter(name)) {
fw.write(Userfile + username + "\n");
fw.write(Passfile);
fw.flush();
fw.close();
}
catch(Exception ex) {
System.out.println("Exception Text: " + ex);
}
//puts lines of text in the file-
//username-"username"
//password-
//
System.out.println("User Created\n");
}
else if(name.exists()) {
System.out.println("User already exists\n");
nameCreate();
}
user.close();
}
catch(Exception ex) {
System.out.println("Exception Text: " + ex);
}
return name;
}
private static void passCreate(File user) {
username = user.toString();
System.out.println(username + "\n");
boolean code = false;
try (Scanner pass = new Scanner(System.in)) {
do{
//opens file and reads until line "password-" and appends it with created password once confirmed
System.out.println("Create a password");
System.out.print("Password: ");
password = pass.nextLine();
if(password.length() >= 8) {
System.out.print("Confirm Password: ");
passcompare = pass.nextLine();
if(password.equals(passcompare)) {
code = true;
System.out.println("Passwords match\n");
//stores password
}
else {
System.out.println("Passwords don't match\n");
}
}
else {
System.out.println("Password needs to be longer than 8 characters\n");
}
}while(!code);
pass.close();
}
catch(Exception ex) {
System.out.println("Exception Text: " + ex);
}
}
private static void userCreate() {
nameCreate();
passCreate(name);
}
}
It's ugly and incomplete, I know, but this problem has kept me from going further. I am able to get to the password creation if I go through existing user option and create a user that way, but if I try to go through the create new user, I get the no line exception. My question is: how do I create more lines for the scanner to use to be able to create a password, or what other options do I have for completing this task. I've tried hasNextLine() and that's what made me realize that there are no more lines. Thanks
