Why the "java lang nullpointerexception" come, if every Player of my 2 Players have one getKey() method?
And why ("space".equals(Greenfoot.getKey()))/("enter".equals(Greenfoot.getKey())) are not still working?
TopInPut wrote ...
2012/1/9
Greenfoot.getKey().equals("enter")/Greenfoot.getKey().equals("space")
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Greenfoot.getKey() returns null if no key has been pressed. To fix this, try storing the key into a string beforehand so you can test it:
String key = Greenfoot.getKey();
If(key!=null && key.equals("space"))
And, if you call it more than once, only the first time will return the key that was pressed. If you have multiple players each checking for keystrokes, it's usually easier to use isKeyDown(...) instead of getKey(). Or otherwise, have the world call getKey() and then control the appropriate player depending on which key was pressed.
But the isKeyDown() can be hold down and the methods go on.
I just want 1 method per Press.;)
But the isKeyDown() can be hold down and the methods go on. I just want 1 method per Press.;)
This:
Or otherwise, have the world call getKey() and then control the appropriate player depending on which key was pressed.
Oh i hate it. -.-
The nice solution doesn't works. :S
Is there another way like getKey()
Or isKeyDown() so changeable, that it just do the method one time per press? ^^
Try what davmac suggested, and have 1 call to getKey() in your main world where it stores the information for all classes to reference. There is also a way to get isKeyDown() to work the way you want but it requires more variables and a bit of trickiness.
The only getButton() method that Greenfoot provides is for the mouse, is that what you mean?
What do you mean by 'is there another way for getKey()'?
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