Creating and Extending Objects with the Factory Patterns : Factory Pattern « Design Pattern « Java Tutorial

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Java Tutorial » Design Pattern » Factory Pattern 
34. 12. 2. Creating and Extending Objects with the Factory Patterns
public class MainClass {
  public static void main(String args[]) {
    SecureFactory factory;

    factory = new SecureFactory();

    Connection connection = factory.createConnection("Oracle");

    System.out.println("You're connecting with " + connection.description());
  }
}

class SecureFactory extends ConnectionFactory {
  public Connection createConnection(String type) {
    if (type.equals("Oracle")) {
      return new SecureOracleConnection();
    else if (type.equals("SQL Server")) {
      return new SecureSqlServerConnection();
    else {
      return new SecureMySqlConnection();
    }
  }
}

abstract class Connection {
  public Connection() {
  }

  public String description() {
    return "Generic";
  }
}

abstract class ConnectionFactory {
  public ConnectionFactory() {
  }

  protected abstract Connection createConnection(String type);
}

class SqlServerConnection extends Connection {
  public SqlServerConnection() {
  }

  public String description() {
    return "SQL Server";
  }
}

class SecureSqlServerConnection extends Connection {
  public SecureSqlServerConnection() {
  }

  public String description() {
    return "SQL Server secure";
  }
}

class SecureOracleConnection extends Connection {
  public SecureOracleConnection() {
  }

  public String description() {
    return "Oracle secure";
  }
}

class SecureMySqlConnection extends Connection {
  public SecureMySqlConnection() {
  }

  public String description() {
    return "MySQL secure";
  }
}
34. 12. Factory Pattern
34. 12. 1. A simple static factory method.
34. 12. 2. Creating and Extending Objects with the Factory Patterns
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