Question

Modify the below Java program to use exceptions if the password is wrong (WrongCredentials excpetion).

import java.util.HashMap;

import java.util.Map;

import java.util.Scanner;

class Role {

String user, password, role;

public Role(String user, String password, String role) {

super();

this.user = user;

this.password = password;

this.role = role;

}

/**

* @return the user

*/

public String getUser() {

return user;

}

/**

* @param user the user to set

*/

public void setUser(String user) {

this.user = user;

}

/**

* @return the password

*/

public String getPassword() {

return password;

}

/**

* @param password the password to set

*/

public void setPassword(String password) {

this.password = password;

}

/**

* @return the role

*/

public String getRole() {

return role;

}

/**

* @param role the role to set

*/

public void setRole(String role) {

this.role = role;

}

}

public class Main{

public static void main(String[] args) {

Map<String, Role> userCredentials = new HashMap<>();

userCredentials.put("Rebecca", new Role("Rebecca", "1234", "user"));

userCredentials.put("Lola", new Role("Lola", "9876", "user"));

userCredentials.put("Michelle", new Role("Michelle", "7777", "super user"));

Scanner sc = new Scanner(System.in);

String name, password;

System.out.println("Login: ");

name = sc.nextLine();

System.out.println("Password: ");

password = sc.nextLine();

if (userCredentials.containsKey(name) && userCredentials.get(name).getPassword().equals(password)) {

System.out.println("Login granted to " + name);

} else {

System.out.println("Wrong credentials");

}

}

}

Answer 1

CODE

import java.util.HashMap;

import java.util.Map;

import java.util.Scanner;

class WrongCredentialsException extends Exception {

public WrongCredentialsException(String message) {

super(message);

}

}

class Role {

String user, password, role;

public Role(String user, String password, String role) {

super();

this.user = user;

this.password = password;

this.role = role;

}

/**

* @return the user

*/

public String getUser() {

return user;

}

/**

* @param user the user to set

*/

public void setUser(String user) {

this.user = user;

}

/**

* @return the password

*/

public String getPassword() {

return password;

}

/**

* @param password the password to set

*/

public void setPassword(String password) {

this.password = password;

}

/**

* @return the role

*/

public String getRole() {

return role;

}

/**

* @param role the role to set

*/

public void setRole(String role) {

this.role = role;

}

}

public class Main {

public static void main(String[] args) throws WrongCredentialsException {

Map<String, Role> userCredentials = new HashMap<>();

userCredentials.put("Rebecca", new Role("Rebecca", "1234", "user"));

userCredentials.put("Lola", new Role("Lola", "9876", "user"));

userCredentials.put("Michelle", new Role("Michelle", "7777", "super user"));

Scanner sc = new Scanner(System.in);

String name, password;

System.out.println("Login: ");

name = sc.nextLine();

System.out.println("Password: ");

password = sc.nextLine();

if (userCredentials.containsKey(name) && userCredentials.get(name).getPassword().equals(password)) {

System.out.println("Login granted to " + name);

} else {

throw new WrongCredentialsException("Wrong credentials");

}

}

}