Hey guys, I am trying to recreate a version of the "Simsimi" app, but i am having trouble referencing the TextBox from Simsimi. I thought about making the Textbox class extend the Simsimi class, or (vice versa), but I am not sure if this is right or the simplest way to do this. Anyway, the way i have it set up, the following error comes up on my screen through the Greenfoot Terminal Window:
"java.lang.NullPointerException
at Simsimi.<init>(Simsimi.java:12)
at world.<init>(world.java:13)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at greenfoot.core.Simulation.newInstance(Simulation.java:520)
at greenfoot.platforms.ide.WorldHandlerDelegateIDE$3.run(WorldHandlerDelegateIDE.java:406)
at greenfoot.core.Simulation.runQueuedTasks(Simulation.java:411)
at greenfoot.core.Simulation.maybePause(Simulation.java:269)
at greenfoot.core.Simulation.runContent(Simulation.java:201)
at greenfoot.core.Simulation.run(Simulation.java:194)"
I have checked line 13 and 12 of the world and Simsimi class respectively, and see no logic nor syntax errors. Please help?
world:
Simsimi:
TextBox Parameter and Method:
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.Color;
import java.awt.Point;
/**
* Write a description of class world here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class world extends World
{
TextBox textbox = new TextBox(new Point(250, 100), "");
Simsimi simsim = new Simsimi();
/**
* Constructor for objects of class world.
*
*/
public world()
{
super(600, 400, 1);
addObject(textbox, 450, 300);
addObject(simsim, 50, 40);
Color gold = new Color(255, 215, 0);
color(gold);
Greenfoot.start();
}
public TextBox getTextbox()
{
return textbox;
}
public Simsimi getSimsim()
{
return simsim;
}
}import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.Color;
/**
* Write a description of class Browser here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Simsimi extends Actor
{
world world = (world) getWorld();
TextBox textbox = world.getTextbox();
GreenfootImage img = getImage();
public Simsimi()
{
img.scale(150, 70);
}
/**
* Act - do whatever the Browser wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
}
}public TextBox(Point size, String text)
{
this.size = size;
this.text = text;
caret = text.length();
paint(false);
panel.addMouseWheelListener(scroller);
}
/**
* Get the contents of this TextBox.
* @return The text in this TextBox.
*/
public String getText()
{
return text;
}