public class CreatingConnection {

private static Connection getDBConnection() {
    Connection dbConnection = null;
    try {
        Class.forName("org.postgresql.Driver");
    } catch (ClassNotFoundException e) {
        System.out.println(e.getMessage());
    }
    try {
        dbConnection = DriverManager.getConnection("jdbc:postgresql::port/db","postgres", "user");
        return dbConnection;
    } catch (SQLException e) {
        System.out.println(e.getMessage());
    }
    return dbConnection;
}
static void createDbUserTable() throws SQLException {
    Connection dbConnection = null;
    Statement statement = null;

    String createTableSQL = "CREATE TABLE DBUSER("
            + "USER_ID NUMBER(5) NOT NULL, "
            + "USERNAME VARCHAR(20) NOT NULL, "
            + "MESSAGE VARCHAR(20) NOT NULL, "
            + ")";

    try {
        dbConnection = getDBConnection();
        System.out.println(dbConnection);
        statement = dbConnection.createStatement();
        statement.execute(createTableSQL);
        System.out.println("Table "dbuser" is created!");
    } catch (SQLException e) {
        System.out.println(e.getMessage());
    } finally {
        if (statement != null) {
            statement.close();
        }
        if (dbConnection != null) {
            dbConnection.close();
        }
    }
}}