NullPointerException, Use variable from another class.

Shoxy

Hello, I have a question. This time I'm making a zombie generator or zombie spawn ( I do not know what to call it ) , so I made a new class "Zombies" in this class I have a constructor and some methods. Generator working now but I have to use PVector "location" from class Player and here is the problem => I have a NullPointerException because I want to use varieable from another class. // Problem is in class Zombies - method "faceToPlayer" ( line 364 ) and i wrote some comments on methods "zombieSpawn()" ( line 163 ) and "ZGenerator()" ( line 173 ) ( in main class ).

If you don't understand something, ask me. Thanks a lot. processingtogether.com/sp/pad/export/ro.K3Qtjdl0csA/rev.36

Chrisir

Is the NullPointerException in line 364?

because this line looks ok with p.

Just make sure that the player is defined with new before you come to line 364

Shoxy

I tried to put p = new Player(width/2-28, height/2-20); after set size ( between lines 42 and 43 ) but still NullPointerException :/ . Player should be created earlier than I call ZGenerate() and zombieSpawn() (line 63 and 64 ) right?

Chrisir

When you use it , yes...

But also the data inside it, the player Position

Chrisir

Use println to Check which var is causing the NullPointerException

Shoxy

I tried every single var but still NullPointerException. Even if I tried var which is defined like int heal = 100; //In Class Player I tried println just 'p' => println(p); and is it null..

Chrisir

Is location from class player defined???

Shoxy

It should by. I have var location and when I create new object Player I give to the var locatoin x and y.

PVector location; Player(float x, float y) { location = new PVector(x, y); }

in main class:

void setup() { // size(1000, 700); fullScreen(1); p = new Player(width/2-28, height/2-20); } And down in draw I call method ZGenerate() where I create new zombie object

Chrisir

println(p); and is it null..

that is causing the error!!!!!!!!

It must not be null!!!!!!!!!!

Make sure you define p!!!!!!

There must be only one p in your sketch!!!!!

Shoxy

OH MY GOD... Yeah you have right.. I had in main class Player p; and also in class Zombies.. X_X ... Thank you!