"NullPointerException" after switching turns

ControlledCopy

So I am trying to make a menu for a game I am building, but when I use the keyPressed to switch turns and Init the Game I get this error message. Any Idea why? Thanks In Advance ;)

space [] Space = new space[800];

int turn=1; //1=menu,2=initgame,3=gameover


void setup()
{ 
size(800,800);
//
if (turn==2)
{
initstarField();
}
}

void draw()
{
background(0);
if (turn==1)
{
menu();
}
else if (turn==2)
{
starField();
}
}

void keyTyped()
{
  if (turn==1 && key=='a')
  turn=2;
}

void menu()
{
if (turn==1)
{
background(0,0,255);

}
}

void initGame()
{

}

void spaceShip()
{

}

void asteroids()
{

}

void distanceTracker()
{

}

void initstarField()
{
for (int i = 0; i < Space.length; i++)
{
Space[i]=new space();
}
}

void starField()
{
translate(width/2, height/2);
for (int i = 0; i < Space.length; i++)
{
Space[i].lightSpeed();
Space[i].create();
}
}


 // class

class space
{
  float x;
  float y;
  float z;
  float pz;

  space()
  {
    x =random(-width, width);
    y =random(-height, height);  
    z =random (width);
    pz=z;
  }

  void lightSpeed()
  {
    z=z-25;
    if (z<1)
    {
      z=width;
      x =random(-width, width);
      y =random(-height, height); 
      pz=z;
    }
  }

  void create()
  {
    //Stars
    float sx = map (x / z, 0, 1, 0, width);
    float sy = map (y / z, 0, 1, 0, height);
    float r= map(z, 0, width, 16, 0);
    fill(255);
    ellipse(sx, sy, r, r);
    //LightSpeed Illusion
    float px = map(x/pz, 0, 1, 0, width);
    float py = map(y/pz, 0, 1, 0, width);
    pz=z;
    stroke(255);
    line(px, py, sx, sy);
  }
}

KevinWorkman

When I run the code you posted I just see a blue window without any errors.

ControlledCopy

You need to click on it and press 'a' to make it switch turns then you'll get a "NullPointerException"

KevinWorkman

Okay, so have you tried debugging your code to figure out exactly why that's happening? Which line is it happening on? Which variable is null?

ControlledCopy

line 77 and void lightSpeed the problem when the turn switches to 2 it gives me that but when I set to turn to 2 from the very beginning at line 3 everything works fine I'm new to programming so I have no idea what to do now

KevinWorkman

Did you click the link I gave you? You need to debug your code to narrow the problem down.

ControlledCopy