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cx31
cx31 wrote ...

2019/7/1

ClassCastExeption

cx31 cx31

2019/7/1

#
So i tried to make grant2 always go to either the x or y coordinate of the next grant one to determine who the next grant one was I used this post Tricky situation... Get the nearest object but there was an error here is my code and the error java.lang.ClassCastException: class grant2 cannot be cast to class grant1 (grant2 and grant1 are in unnamed module of loader java.net.URLClassLoader @57092432) at grant.a(grant.java:67) at grant2.act(grant2.java:17) at greenfoot.core.Simulation.actActor(Simulation.java:567) at greenfoot.core.Simulation.runOneLoop(Simulation.java:530) at greenfoot.core.Simulation.runContent(Simulation.java:193)
?
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  public double getDistance(Actor actor) {
   return Math.hypot(actor.getX() - getX(), actor.getY() - getY());
 }
   
   
 public Actor getNearestActor()                
    { 
       List<Actor> nearActors = getObjectsInRange(300, Actor.class); 
       Actor nearestActor = null; 
       double nearestDistance = 300; 
       double distance;  
       for (int i = 0; i < nearActors.size(); i++) 
       { 
           distance = getDistance(nearActors.get(i)); 
           if (distance < nearestDistance) 
           { 
               nearestActor = nearActors.get(i); 
               nearestDistance = distance; 
           } 
       }   return nearestActor;
}
   public grant()
   {
        GreenfootImage image = getImage();
       image.scale(image.getWidth() / 2, image.getHeight() / 2);
       setImage(image);
            
       b=System.currentTimeMillis();;
        
   }
   public void a(int range, int b)
   {Math.round(spin);
        List<grant> isi = getObjectsInRange(range, grant.class);
       x=getX();
       y=getY();
     int c=0;
       int spinn = (int) spin;
       getWorld().showText("b"+spin, 400, 400);
      
      if(!isi.isEmpty())
    { 
           
         grant1 grant1 = (grant1) getNearestActor();
         
 
        spin =(Math.atan2(grant1.y-y,grant1.x-x)/Math.PI*360);
        if(Math.abs(getX()-grant1.x)!=0||Math.abs(getY()-grant1.y)!=0)
        {if(Math.abs(getX()-grant1.x)<=Math.abs(getY()-grant1.y))
           
           {   if(getX()-grant1.x<=0)
              {move(1); 
            }if(getX()-grant1.x>=0)
              {move(-1); 
            }
           }
            
         if(Math.abs(getY()-grant1.y)<=Math.abs(getX()-grant1.x))
         
           {  if(getY()-grant1.y<=0)
              { setLocation(getX(), getY()+1);
            }if(getY()-grant1.y>=0)
              { setLocation(getX(), getY()-1);
             
           }
         }
        }
 }
at greenfoot.core.Simulation.run(Simulation.java:183) so yeah hope someone could help me out fast
danpost danpost

2019/7/1

#
Replace line 43 with:
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Actor actor = getNearestActor();
if (!(actor instanceof grant1)) return;
grant1 grant1 = (grant1)actor;
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