Greenfoot

rodut wrote ...

2021/2/14

Problem with numberOfObjects

rodut

2021/2/14

Hi. I'm just learning Greenfoot. I have a problem with this function. This is my code:

 int nrrockets = numberOfObjects(Rocket.class); 
 if(nrrockets==0) 
{lives=lives-1;addObject(rocket,75,300);};

rodut

2021/2/14

It says it cannot be applied to given types.

danpost

2021/2/14

The numberOfObjects method has NO parameters and always returns the total number of Actor class objects in the world. Use:

if (getObjects(Rocket.class).isEmpty())

int nrrockets = getObjects(Rocket.class).size();

rodut

2021/2/14

Thanks man. It works.

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