there's a nullpointerexception error when it reaches level 2. please tell me how to fix i want to pass and not fail a subject. and also is there a way to restart the counter but with different total count and actor that gets shot
here's the blob (the "bullet" the guardian shoots)
here's the first counter code
here's the second counter's code
here's the world's code
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class MyWorld here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class MyWorld extends World
{
private Counter counter;
private Counter2 counter2;
public MyWorld()
{
// Create a new world with 600x400 cells with a cell size of 1x1 pixels.
super(600, 400, 1);
prepare();
}
public Counter getCounter()
{
return counter;
}
public Counter2 getCounter2()
{
return counter2;
}
/**
* Prepare the world for the start of the program.
* That is: create the initial objects and add them to the world.
*/
private void prepare()
{
addObject(new Guardian(), 485, 321);
counter = new Counter();
addObject(counter, 169, 213);
addObject(new Level1(),173, 303);
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
public class Blob extends Guardian
{
// private Guardian myHero;
public Blob()
{
//this.myHero = myHero;
}
/**
* Act - do whatever the Shot wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
int xpos = getX();
if (xpos > 0)
{
xpos = xpos - 5;
setLocation(xpos, getY());
Actor Level1 = getOneIntersectingObject(Level1.class);
Actor Level2 = getOneIntersectingObject(Level2.class);
if(isTouching(Level2.class))
{
hitAVillain2();
MyWorld theWorld = (MyWorld) getWorld(); // get a reference to the world
Counter2 counter2 = theWorld.getCounter2();
if(counter2.total2()==0)
{
getWorld().removeObject(Level2);
}
getWorld().removeObject(this);
}
if (Level1 != null)
{
// We've hit the villain!
hitAVillain();
MyWorld theWorld = (MyWorld) getWorld(); // get a reference to the world
Counter counter = theWorld.getCounter();
if(counter.total()==0)
{
getWorld().removeObject(Level1);
getWorld().addObject (new Level2 (),174, 320);
getWorld().removeObject(counter);
getWorld().addObject (new Counter2 (),169, 213);
}
getWorld().removeObject(this);
}
}
else {
// I reached the top of the screen
getWorld().removeObject(this);
}
}
private void hitAVillain()
{
// get a reference to the counter
MyWorld theWorld = (MyWorld) getWorld();
Counter counter = theWorld.getCounter();
counter.bumpCount(1);
}
private void hitAVillain2()
{
// get a reference to the counter
MyWorld theWorld = (MyWorld) getWorld();
Counter2 counter2 = theWorld.getCounter2();
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.Color;
/**
* Write a description of class Counter here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Counter extends Actor
{
private int totalCount = 5;
public Counter()//constructor
{
setImage(new GreenfootImage("Life: " + totalCount, 20, greenfoot.Color.WHITE, greenfoot.Color.BLACK));
}
public void act()
{
setImage(new GreenfootImage("Life: " + totalCount, 20, greenfoot.Color.WHITE, greenfoot.Color.BLACK));
}
/**
* Increase the total amount displayed on the counter, by a given amount.
*/
public void bumpCount(int amount)
{
totalCount -= amount;
}
public int total()
{
return totalCount;
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.Color;
/**
* Write a description of class Counter here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Counter2 extends Actor
{
private int totalcount2 = 10;
public Counter2()//constructor
{
setImage(new GreenfootImage("Life: " + totalcount2, 20, greenfoot.Color.WHITE, greenfoot.Color.BLACK));
}
public void act()
{
setImage(new GreenfootImage("Life: " + totalcount2, 20, greenfoot.Color.WHITE, greenfoot.Color.BLACK));
}
/**
* Increase the total amount displayed on the counter, by a given amount.
*/
public void bumpcount(int amount2)
{
totalcount2 -= amount2;
}
public int total2()
{
return totalcount2;
}
}
