Worked before. Suddently after re-opening simulation it stopped working.
and the message i get in terminal
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:542)
at java.lang.Integer.parseInt(Integer.java:615)
at ball.addedToWorld(ball.java:12)
at greenfoot.World.addObject(World.java:428)
at myworld.<init>(myworld.java:10)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at greenfoot.core.Simulation.newInstance(Simulation.java:617)
at greenfoot.platforms.ide.WorldHandlerDelegateIDE.lambda$instantiateNewWorld$7(WorldHandlerDelegateIDE.java:430)
at greenfoot.core.Simulation.runQueuedTasks(Simulation.java:502)
at greenfoot.core.Simulation.maybePause(Simulation.java:305)
at greenfoot.core.Simulation.runContent(Simulation.java:218)
at greenfoot.core.Simulation.run(Simulation.java:211)
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
public class ball extends Actor
{
private double posx,posy,vx,vy,ax,ay,dt=0.1;
private int Powerx;
private int Powery;
public void addedToWorld(World myworld)
{
String input = Greenfoot.ask("What do you want the power horizontal to be? Note only integers");
String input2 = Greenfoot.ask("What do you want the power vertical to be? Note only integers");
Powerx = Integer.parseInt(input);
Powery = Integer.parseInt(input2);
posx=getX();
posy=getY();
ax=0;
ay=10;
vx=20;
vy=-20;
}
public void act()
{
posx+=vx*dt+-(Powerx)*ax*dt*dt;
posy+=vy*dt+-(Powery)*ay*dt*dt;
vx+=ax*dt;
vy+=ay*dt;
setLocation((int)posx,(int)posy);
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
public class myworld extends World
{
public myworld()
{
super(600, 400, 1,false);
addObject(new ball(),100,getHeight()-100);
}
}
