Is there a better way to do this?

"if (event.entity instanceof EntityZombie || event.entity instanceof EntitySkeleton || event.entity instanceof EntitySkeleton || event.entity instanceof EntityCreeper) {"

Hard to answer when you dont' indicate what it is you are trying to do.

 

In what you listed, no need to look for EntitySkeleton twice.

If your checking for the same thing in all of them, then no. (Like delphi said remove the second EntitySkeleton).

Well, if for "easy" you mean less typing, then probably not unless all the entities shared something in common that made them different than all other entities.  For example, if you wanted to check for all EntityMob then you wouldn't have to list all the mobs.

 

But sometimes in computer programming you just have to list out all the cases and handle them.

if you're going to be using it a lot, you could extract the checks to a method:

 

private static boolean requiredMob(Entity testEntity){
return (testEntity instanceof EntityZombie || testEntity instanceof EntitySkeleton || testEntity instanceof EntityCreeper);
}

if(requiredMob(event.entity)){
//do code
}

I presume you're trying to do a lot of specific comparisons. You could do this:

 

return (testEntity instanceof EntityZombie ||
    testEntity instanceof EntitySkeleton ||
    testEntity instanceof EntityCreeper);

 

To make the code easier to read, but no, there isn't an easier way to do what you're already doing.

Some more OOC ?

 

public class Group{
    private final List<Class> members;
    public Group(Class...classes){
         this.members = Arrays.asList(classes);
    }
    
    public boolean hasMember(Class<?> test){
       for(Class<?> member:members){
           if(member.isAssignableFrom(test))
               return true;
      }
       return false;
   }

}

public Group meanVanillaBiped = new Group(EntityZombie.class, EntitySkeleton.class, EntityCreeper.class);

Or you could check if entity is undead.

Thank you all! By the Way the second skeleton was me forgetting to change it to creeper...