So i'd been asked to make a program which have a login page And i should use vector to make this login page. (Java Language) if i only register 1 user on this program. it will work, but if i resist more than 1 user, it will automatically break and said indexoutofbound. This is the code
import java.util.Scanner;
import java.util.Vector;
public class T028_J1H2 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input= new Scanner (System.in);
int choice;
String user;
String pass;
String age;
String address;
String email;
String hobby;
int count=0;
Vector<String> username = new Vector<String>();
Vector<String> password = new Vector<String>();
Vector<String>umur= new Vector<String>();
Vector<String>alamat= new Vector<String>();
Vector<String>temp_email = new Vector<String>();
Vector<String>hobi = new Vector<String>();
Vector<Vector<String>> profile = new Vector<Vector<String>>();
do{
System.out.println("1. Login");
System.out.println("2. Register");
System.out.println("3. Exit");
System.out.print("Choose : ");
choice = input.nextInt();
input.nextLine();
switch (choice)
{
case 1:
int pilihan;
int index=0;
String login_user;
String login_password;
if(profile.isEmpty())
{
System.out.println("Please Register First");
}
else
{
int flag_user=0;
int flag_pass=0;
do{
System.out.print("User : ");
login_user=input.nextLine();
System.out.print("Password : ");
login_password=input.nextLine();
for(int i=0;i<count;i++)
{
if(login_user.equals(username.get(i)))
{
flag_user=1;
}
if(login_password.equals(password.get(i)))
{
flag_pass=1;
}
}
if(flag_user==0 || flag_pass==0)
{
System.out.println("Username/Password Wrong");
}
else if(flag_user==1 && flag_pass==1)
{
index++;
break;
}
}while(flag_user==0 || flag_pass==0);
if(flag_user==1 && flag_pass==1)
{
do{
System.out.println("1. View Profile");
System.out.println("2. Buy Product");
System.out.println("3. View Product");
System.out.println("4. Insert Product");
System.out.println("5. Update Product");
System.out.println("6. Delete Product");
System.out.println("7. Exit");
System.out.print("Choose : ");
pilihan=input.nextInt();input.nextLine();
switch (pilihan)
{
case 1:
System.out.println("View Profile");
System.out.println("=========================");
System.out.println("User : " + profile.get(index-1).get(0));
System.out.println("Age : "+profile.get(index-1).get(2));
System.out.println("Address : "+profile.get(index-1).get(3));
System.out.println("Email : "+profile.get(index-1).get(4));
System.out.println("Hobby : "+profile.get(index-1).get(5));
break;
case 2:
break;
case 3:
break;
case 4:
break;
case 5:
break;
case 6:
break;
case 7:
break;
}
}while(pilihan!=7);
}
}
break;
case 2:
username = new Vector<String>();
password = new Vector<String>();
umur= new Vector<String>();
alamat= new Vector<String>();
temp_email = new Vector<String>();
hobi = new Vector<String>();
System.out.println("Please fill the data first");
System.out.println("=======================================");
System.out.print("Input your username[5..20 | must be Alphanumeric] : ");
user=input.nextLine();
username.add(user);
System.out.print("Input Your Password[5..20 | must be Alphanumeric] : ");
pass=input.nextLine();
password.add(pass);
System.out.print("Input your age[17-50] : ");
age=input.nextLine();
umur.add(age);
System.out.print("Input your address : ");
address=input.nextLine();
alamat.add(address);
System.out.print("Input your e-mail : ");
email=input.nextLine();
temp_email.add(email);
System.out.print("Input your hobby : ");
hobby=input.nextLine();
hobi.add(hobby);
profile.add(username);
profile.add(password);
profile.add(umur);
profile.add(alamat);
profile.add(temp_email);
profile.add(hobi);
System.out.println("Register Successful!");
input.nextLine();
count++;
break;
case 3:
break;
}
}while(choice!=3);
}
}
