/** File name: DbComponentFactory.java **/


package factorypattern;

public class DbComponentFactory {

    public static AbstractDbComponent createDbComponent(String dbcomponentname) {
        
        if (dbcomponentname == "ORACLE")  {
            return new OracleDbComponent();
        }
        else if (dbcomponentname == "MYSQL")  {
            return new MysqlDbComponent();
        }
        return null ;
    }
 
}






/** File name: OracleDbComponent.java **/

package factorypattern;

public abstract class AbstractDbComponent {
    public abstract void execute();


}






/** File name: OracleDbComponent.java **/

package factorypattern;

public class OracleDbComponent extends AbstractDbComponent {

    public OracleDbComponent() {
        System.out.println("Creating ORACLE DB Component");
    }
    
    public void execute() {
        System.out.println("ORACLE: Executing using OracleDbComponent") ;
    }
}





/** File name: MysqlDbComponent.java **/

package factorypattern;

public class MysqlDbComponent extends AbstractDbComponent {
    public MysqlDbComponent() {
        System.out.println("Creating MYSQL DB Component");
    }
    
    public void execute() {
        System.out.println("MYSQL:  Executing using MysqlDbComponent") ;
    }
}






/** File name: Main.java **/

package factorypattern;

public class Main {
    
    /** Creates a new instance of Main */
    public Main() {
        System.out.println("TEST for oracle component: ");
        AbstractDbComponent dbcomponent = 
                  DbComponentFactory.createDbComponent("ORACLE");
        dbcomponent.execute();
        
        
        System.out.println("\n\n\nTEST for Mysql component: ");
        dbcomponent = DbComponentFactory.createDbComponent("MYSQL");
        dbcomponent.execute();
        
    }

    public static void main(String[] args) {
        new Main();
    }
    
}







Following output is generated:




TEST for oracle component: 
Creating ORACLE DB Component
ORACLE:   Executing using OracleDbComponent



TEST for Mysql component: 
Creating MYSQL DB Component
MYSQL:  Executing using MysqlDbComponent
BUILD SUCCESSFUL (total time: 0 seconds)