I want to place text when one of my classes eats another class but I get the error message
java.lang.NullPointerException
at TurtleBlaster.newText(TurtleBlaster.java:43)
at TurtleBlaster.tryToEatSpaceTurtle(TurtleBlaster.java:31)
at TurtleBlaster.act(TurtleBlaster.java:19)
at greenfoot.core.Simulation.actActor(Simulation.java:565)
at greenfoot.core.Simulation.runOneLoop(Simulation.java:523)
at greenfoot.core.Simulation.runContent(Simulation.java:213)
at greenfoot.core.Simulation.run(Simulation.java:203)
Here is the class
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class TurtleBlaster here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class TurtleBlaster extends Animal
{
/**
* Act - do whatever the TurtleBlaster wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
tryToEatSpaceTurtle();
}
public void tryToEatSpaceTurtle()
{
if (canSee(SpaceTurtle1.class))
{
eat(SpaceTurtle1.class);
createNewSpaceTurtle2();
createNewGreenAlien1();
removeObject();
newText();
}
}
public void newText()
{
Label newLabel;
newLabel = new Label("Now you have a Turtle Blaster! Press space to shoot");
World world;
world = getWorld();
world.addObject(newLabel, 1, 158);
}
/**
* Create a new Turtle and place it randomly
*/
public void createNewGreenAlien1()
{
GreenAlien1 newGreenAlien1;
newGreenAlien1 = new GreenAlien1();
World world;
world = getWorld();
int worldWidth = world.getWidth();
int worldHeight =world.getHeight();
int x = Greenfoot.getRandomNumber(worldWidth);
int y = Greenfoot.getRandomNumber(worldHeight);
world.addObject(newGreenAlien1, x, y);
}
/**
* Create a new Turtle and place it randomly
*/
public void createNewSpaceTurtle2()
{
SpaceTurtle2 newSpaceTurtle2;
newSpaceTurtle2 = new SpaceTurtle2();
World world;
world = getWorld();
world.addObject(newSpaceTurtle2, 307, 247);
}
public void removeObject()
{
World world;
world = getWorld();
world.removeObject(this);
}
}
