Java passing Arrarylist fromm one class to another class

1

How to you pass an arraylist from one class to another. in the my first class i have a class call getUserSalt which return mysalt. I want to pass mysalt to the second class verifyPassword.

@Override
    public   List<User> getUserSalt(String username,byte[] password,Connection conn) {
        User usersalt=new User();
        List <User> mysalt=new ArrayList<>();
        try(PreparedStatement stmt=conn.prepareStatement("SELECT * FROM db_users WHERE  username=?")) {
            stmt.setString(1,username);
            ResultSet resultSet=stmt.executeQuery();

            while (resultSet.next()){
                usersalt.setUsername(resultSet.getString(1));
                usersalt.setPassword(resultSet.getBytes(2));
                return mysalt;



            }
        }catch ( SQLException e){
            System.out.println( "error getting salt"+ e.getSQLState());

        }

        return mysalt;
    }

//Verify password
    public List<User> verifyPassword(String username, String password, byte[]salt){
       UserDOA a=new UserDOA();
        for(int i=0;i<a.getUserSalt();i++){

        }

    }
2

It looks like there is some naming confusion going on here. getUserSalt() and verifyPassword() are methods, not classes. I assume these methods are in different classes.

You cannot pass your mySalt result to the verifyPassword() method directlyh. This method takes a String, a String and a byte[]. Your mySalt is a List<User>. verifyPassword() actually returns a List<User> - but it doesn’t take one as a parameter.

I think you want a method that takes a List<User> and breaks each User into its name and password Strings and the ‘salt’ byte[], and then passes those details to the verifyPassword() method. Alternately change verifyPassword() so that it takes a List<User> (List<User> verifyPassword(List<User>) { }) and then in the method loop through each User as mentioned before generating the UserDOA.

3

Thanks, yes you are right. My bad, these methods are in two separate classes. Thanks for taking your time to reply.