public class ConnectionFactory {

private static final String DRIVER = "org.postgressql.Driver";
private static final String URL = "jdbc:postgresql://localhost:5432/NomedoDB";
private static final String USER = "postgres";
private static final String PASS = "";

public static Connection getConnection() throws SQLException {
    try {
        Class.forName(DRIVER);

        return DriverManager.getConnection(URL, USER, PASS);
    } catch (ClassNotFoundException ex) {
        throw new RuntimeException("Erro na conexão", ex);
    }
}
}

public static void main(String[] args) throws SQLException {
    // TODO code application logic here
    ConnectionFactory conn = new ConnectionFactory();
    conn.getConnection();
}