Create database postgresql using JAVA

Hello i want to create a database postgresql using Java but i got an error message here is my code :

try {
                Connection c=null;
                Statement stmt=null;
                Class.forName("org.postgresql.Driver");

                c = DriverManager
            .getConnection("jdbc:postgresql://localhost:5432/",
            "postgres", "Admin@2014");

                c.setAutoCommit(false);
                System.out.println("Opened database successfully");

                stmt = c.createStatement();

               String sql = "CREATE DATABASE db OWNER postgres TABLESPACE numerique; ";

                stmt.executeUpdate(sql);    

             stmt.close();
                c.commit();
                c.close();

            } catch (Exception ee) {
                    System.err.println( ee.getClass().getName()+": "+ ee.getMessage() );
                    System.exit(0);
            }

and here is the error message that i got :

org.postgresql.util.PSQLException: ERREUR: CREATE DATABASE ne peut pas être exécuté dans un bloc de transaction

thank you for you're help