Greenfoot

Gamezocker

2014/3/5

#

Hello, I have a monster class. In it are Monster-Blue and Monster-Yellow. I want to spawn a monster from it. I would say to Java: "Spawn me an object of the superclass Monster" How have I to program it?

danpost

2014/3/5

#

Gamezocker wrote...

I have a monster class. In it are Monster-Blue and Monster-Yellow. I want to spawn a monster from it.

Normally, when something is to be spawned out of thin air, it is done in the subclass of World. However, if you want to say "Monster, spawn a subclass of yourself.", this command should still originate from your subclass of World using something like 'Monster.spawnRandom(this);' and you would need to create a static method in the Monster class that randomly creates an instance of one of its subclasses and adds it to the world given in the argument of the method. A multiple 'if-else' or a 'switch' will probably need to be used within the static method to cover all possible subclass types.

davmac

2014/3/5

#

I would say to Java: "Spawn me an object of the superclass Monster" How have I to program it?

Maybe I don't understand the question properly but: the same way you always do:

getWorld().addObject(new Monster(), x, y);

Gamezocker

2014/3/6

#

i have a solution for my plan:

int g = Greenfoot.getRandomNumber(20);
if(g == 10)
{
    getWorld().addObject(new Monster-Blue(), x, y);
}
if(g == 20)
{
    getWorld().addObject(new Monster-Yellow(), x, y);
}

danpost

2014/3/7

#

Gamezocker wrote...

i have a solution for my plan:

int g = Greenfoot.getRandomNumber(20);
if(g == 10)
{
    getWorld().addObject(new Monster-Blue(), x, y);
}
if(g == 20)
{
    getWorld().addObject(new Monster-Yellow(), x, y);
}

'g' will never be '20'. For twenty possibilities, 'getRandomNumber' will return a number between '0' and '19' inclusive; twenty would be a twenty-first possibility.

Gamezocker

2014/3/7

#

ok than g = Greenfoot.getRandomNumber(21);

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Spawning from Superclass