... by designing a Façade (Figure 13.2) consisting of a Database class and a Results class, we can build a much more usable system. Figure 13.2. A Façade that encloses many of the java. sql.* classes. ... Employee(String _name, float _salary) { name = _name; salary = _salary leaf = true; } // public Employee(Employee _parent, String _name, float _salary) { name = _name; salary = _salary; parent ... enclosing classes that contain all of the significant methods of the Connection, ResultSet, Statement, and MetaData classes. These are the Database class methods: class Database { public Database(String...