Using full words as variables for login system [closed]

Answer 1

To convert integers to Strings you can use .toString()

final String UserID = new Integer(5555).toString(); 
final String Password = new Integer(1234).toString();
final String StudentNumber = new Integer(22334455).toString();

Answer 2

    final int UserID = 5555; 
    final int Password = 1234;
    final int StudentNumber = 22334455;
String UserID_str = String.valueOf(UserID);
String Password_str = String.valueOf(Password);
String StudentNumber_str = String.valueOf(StudentNumber);