I'm getting this error with showText, and I'm not sure why
java.lang.NullPointerException
at RBC.youLost(RBC.java:79)
at RBC.act(RBC.java:29)
at greenfoot.core.Simulation.actActor(Simulation.java:567)
at greenfoot.core.Simulation.runOneLoop(Simulation.java:530)
at greenfoot.core.Simulation.runContent(Simulation.java:193)
at greenfoot.core.Simulation.run(Simulation.java:183)
Thanks
public class RBC extends Actor
{
private int imageNumber;
private int newColor;
public static int rbc = 9;
public RBC (int i)
{
imageNumber = i; //set class image number equal to i
}
/**
* Act - do whatever the RBC wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
move(1+Greenfoot.getRandomNumber(4));
wallBounce();
turn(-30+Greenfoot.getRandomNumber(61));
infect();
youLost();
}
public void wallBounce()
{
if(isAtEdge())
{
turn(180);
changeColor();
}
}
public void changeColor()
{
newColor = Greenfoot.getRandomNumber(2); //generate a new integer from 0-1 that will become new color
while(newColor==imageNumber) //if new color is equal to old color
{
newColor = Greenfoot.getRandomNumber(2); //regenerates new color
}
imageNumber=newColor; // update current color of ball
setImage("rbc-"+imageNumber+".png");
}
public boolean canSee(Class otherActor)
{
Actor actor = getOneObjectAtOffset(0,0, otherActor); //store an actor in variable if two images are mapped on to eachother
if(actor !=null)
{
return true;
}
else
{
return false;
}
}
public void infect()
{
if(canSee(Virus.class))
{
getWorld().removeObject(this);
rbc--;
}
}
public void youLost()
{
if(rbc==0)
{
getWorld().showText("YOU LOST", 400, 300);
Greenfoot.stop();
rbc = 9;
}
}
}