Password.java

package warmup;

import java.io.Console;
import java.util.Arrays;
import java.io.IOException;

public class Password {
    
	public static String [] passwords = {"monday", "tuesday", "wednesday"};
	
    public static void main (String args[]) throws IOException {

        Console c = System.console();
        if (c == null) {
            System.err.println("No console.");
            System.exit(1);
        }

        String login = c.readLine("Enter your login: ");
        char [] oldPassword = c.readPassword("Enter your old password: ");

        if (verify(login, oldPassword)) {
            boolean match= false;
            do {
                char [] newPassword1 = c.readPassword("Enter your new password: ");
                char [] newPassword2 = c.readPassword("Enter new password again: ");
                match =  Arrays.equals(newPassword1, newPassword2);
                if (!match) {
                    c.format("Passwords don't match. Try again.%n");
                } else {
                    change(login, newPassword1);
                    c.format("Password for %s changed.%n", login);
                }
                Arrays.fill(newPassword1, ' ');
                Arrays.fill(newPassword2, ' ');
            } while (!match);
        }
    }
    
    static boolean verify(String login, char[] password) {
    	
    	char [] passwordToCheck = null;
    	boolean match = false;
    	for(int i=0;i<passwords.length; i++){
    		passwordToCheck = passwords[i].toCharArray();
    		if(Arrays.equals(password, passwordToCheck)){
    			match = true;
    			break;
    		}
    	}
        return match;
    }

    static void change(String login, char[] password) {
        // Modify this method to change
        // password according to your rules.
    }
}