Duvida com utilização de List

public static List <Usuario> BuscarListaUsuario() {
        Usuario userTemp; 
        List <Usuario> listaUserTemp = null;
        
        try {            
            Conecta();
            st = conn.createStatement();
            rs = st.executeQuery("Select * from Usuario");
            while (rs.next()) {     
                userTemp = new Usuario();
                userTemp.setUsusId(rs.getInt("us_usID"));
                userTemp.setUsusNome(rs.getString("us_usNome"));
                userTemp.setUsusLogin(rs.getString("us_usLogin"));
                userTemp.setUsusPassoword(rs.getString("us_usPassoword"));
                userTemp.setUspePerfil(rs.getString("us_pePerfil"));                                    
                listaUserTemp.add(userTemp);
            }
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
        return listaUserTemp;
    }