Greenfoot

2011/6/26

Objects returned by getObjects don't have methods/variables?

2011/6/26

I am trying to get all of the objects in the world that are an instance of my "PowerSource" class, and then move them. However, when I use getObjects(PowerSource.class), all the powerSource objects returned don't seem to have any methods or variable, as even if I try to use nodes.get(0).getX(), I get a compile error saying 'cannot find symbol - method getX()' What am I doing wrong?

Busch2207

2011/6/26

I think this might be the easiest solution:

List<PowerSource> PSList = getObjects(PowerSource.class);
for(PowerSource PS : PSList)
{
PS.setLocation(PS.getX(),PS.getY());
}

The "for" let Greenfoot go throw the List and call one Object after the other "PS". Then you can write in the {} - Brickets, what Greenfoot has to do and you can use the Objects with the name "PS". and if you only want to get the first Object in the list you write:

List<PowerSource> PSList = getObjects(PowerSource.class);
PSList.get(0).setLocation(PSList.get(0).getX(),PSList.get(0).getY());

List<PowerSource> PSList = getObjects(PowerSource.class);
PowerSource PS = PSList.get(0);
PS.setLocation(PS.getX(),PS.getY());

Henrik00

2012/10/3

I think you might have to use the getY() to, not just get() if that's what you did. so i think it should look like this: (getX(), getY()); But I'm no expert, if that's not right I have no idea actually.

danpost

2012/10/3

Here is what was happening. 'getObjects(PowerSource.class)' returns a list of objects of type 'Object'. Objects of that type cannot use 'Actor' class methods or variables. A simple way without having to import the list class

for (Object obj : getObjects(PowerSource.class))
{
    PowerSource ps = (PowerSource) obj; // sub-casting
    // change location of 'ps'
}

Hope this makes sense.

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Objects returned by getObjects don't have methods/variables?