I need to create a new instance of a class from an array of class objects like this:
static Class[] spells = {Fireball.class, Iceball.class};
So when I want to call the fireball i should be able to do something like
Spell Currentspell = new spells[0](posx, posy);
Fireball and Iceball is by the way child classes of Spell.
How do i do this?
Thanks in regards.
Constructor constructor = spells[0].getConstructor(int.class, int.class);
Spell Currentspell = (Spell)constructor.newInstance(posx, posy);
try { Constructor constructor = spells[0].getConstructor(Integer.class, Integer.class); Spell Currentspell = (Spell)constructor.newInstance(100, 100); } catch (Throwable e) { System.err.println(e); } But it doesn't give me an error or create the class instance
Currentspell instance null? try catching Exception e rather than Throwable e. Also, can you post the constructor for Fireball that you are trying to use ?You need to invoke the appropriate constructor of the class by reflection.
See the "Creating new objects" section at http://java.sun.com/developer/technicalArticles/ALT/Reflection/
You use the getConstructor() method to get the specific constructor you want and then call newInstance() on the constructor object.
Well, for one thing you will want to narrow down the type of class that can be stored in your array. And second, your instantiation code is off. Without going into wether this is the best way to accomplish this, here is some (better) code:
static Class<Spell>[] spells = new Class<Spell>[] { Fireball.class, Iceball.class };
Spell currentSpell = spells[someIndex].newInstance();
