Java program on Custom Exceptions, Email application example

PROGRAM:

import java.util.Scanner;

public class EmailApplication {
    public static void main(String[] args) {
        String username, password;
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter username and password to create account");
        System.out.print("Username: ");
        username = sc.next();
        System.out.print("Password: ");
        password = sc.next();
        Account acc = new Account(username, password);
        System.out.println("Account created successfully!");
        acc.login();
    }

}

class Account {
    String username, password;

    public Account(String username, String password) {
        super();
        this.username = username;
        this.password = password;
    }

    void login() {
        String uname, pass;
        Scanner sc = new Scanner(System.in);
        try {
            System.out.println("Enter username and password to login");
            System.out.print("Username: ");
            uname = sc.next();
            if (!uname.equals(username))
                throw new UsernameException();
            System.out.print("Password: ");
            pass = sc.next();
            if (!pass.equals(password))
                throw new PasswordException();
            System.out.println("Login successful!");
        } catch (UsernameException u) {
            System.out.println(u.getMessage());
        } catch (PasswordException p) {
            System.out.println(p.getMessage());
        } catch (Exception e) {
            System.out.println("Exception occured");
        }
    }
}

class UsernameException extends Exception {
    public String getMessage() {
        return "Invalid username!";
    }
}

class PasswordException extends Exception {
    public String getMessage() {
        return "Incorrect Password!";
    }
}

OUTPUT:

TRIAL 1:

Enter username and password to create account
Username: programing
Password: digest
Account created successfully!
Enter username and password to login
Username: programing
Password: digest
Login successful!

TRIAL 2:

Enter username and password to create account
Username: programing
Password: digest
Account created successfully!
Enter username and password to login
Username: programming
Invalid username!

TRAIL 3:

Enter username and password to create account
Username: programing
Password: digest
Account created successfully!
Enter username and password to login
Username: programing
Password: language
Incorrect Password!