Dynamic object call

Question

hi i have following code:
     switch (type) {
               default:
               case 1:
                    objSquare sq = new objSquare(positionX, positionY, positionX1,
                              positionY1);
                    sq.color = color;
                    sq.paint(g);
                    break;
               case 2:
                    objArc ac = new objArc(positionX, positionY, positionX1,
                              positionY1);
                    ac.color = color;
                    ac.paint(g);
                    break;
}it is possible to create Java object dynamicaly? So there will be no switch, but i will load object name to call from database...for example, this "objSquare sq = new objSquare" will be called depending on object requested, so i dont need many switch cases, just one object call..
more details:
i have DB table with:
id object_id object_name etc....
and i want to load object in java that corresponds with object_name variable i will get from DB...it is possible?

Answer 1

You can use reflection for this, or use a map of names to factory pattern. I'd go with a factory, as it's not as open to insecurities. So have a HashMap<String, Class> or HashMap<String, Factory> where Factory is an interface with an appropriate method to create your objects, and Class is java.lang.Class and you create your objects using the newInstance method.