import net.minecraft.entity.ai.EntityAIAttackRangedBow; //导入依赖的package包/类
@Override
   public void onUpdate(ItemStack stack, World world, Entity entity, int itemSlot, boolean isSelected) {
	
	if (stack.getItemDamage() != 20)
		return;
	
	if (!(entity instanceof EntityPlayer) || (entity instanceof FakePlayer))
		return;
	
	if (itemSlot < ((EntityPlayer)entity).inventory.getHotbarSize()) {
		List<EntityLiving> entities = entity.worldObj.getEntitiesWithinAABB(EntityLiving.class, new AxisAlignedBB(entity.getPosition().add(-range, -range, -range), entity.getPosition().add(range, range, range)));
		
		for (EntityLiving ent : entities) {
			List<EntityAITaskEntry> entries = new ArrayList(ent.tasks.taskEntries);
			entries.addAll(new ArrayList(ent.targetTasks.taskEntries));
			
			for (EntityAITaskEntry entry : entries) {
				if (entry.action instanceof EntityAIAttackRangedBow) {
					makeSkellyShootSlower((EntityAIAttackRangedBow)entry.action);
				}
			}
			if (ent instanceof EntityCreeper)
				ReflectionHelper.setPrivateValue(EntityCreeper.class, (EntityCreeper)ent, 60, this.FUSETIME);
		}
	}
}
 

import net.minecraft.entity.ai.EntityAIAttackRangedBow; //导入依赖的package包/类
@SubscribeEvent
public void onSkeletonUpdate(LivingEvent.LivingUpdateEvent event) {
    if (!(event.getEntityLiving() instanceof EntitySkeleton)) {
        return;
    }
    EntitySkeleton skeleton = (EntitySkeleton) event.getEntityLiving();
    EntityAITasks tasks = skeleton.tasks;
    boolean containsOld = false;
    Iterator<EntityAITasks.EntityAITaskEntry> itr = tasks.taskEntries.iterator();
    while (itr.hasNext()) {
        EntityAITasks.EntityAITaskEntry entry = itr.next();
        if (entry.action instanceof EntityAIAttackRangedBow) {
            itr.remove();
        }
        if (entry.action instanceof EntityAIAttackRanged) {
            containsOld = true;
        }
    }
    if (!containsOld) {
        tasks.addTask(4, new EntityAIAttackRanged(skeleton, 1.0D, 20, 15.0F));
    }
}
 

import net.minecraft.entity.ai.EntityAIAttackRangedBow; //导入依赖的package包/类
private void makeSkellyShootSlower(EntityAIAttackRangedBow aiEntry) {
	
	int timeShoot = ReflectionHelper.getPrivateValue(EntityAIAttackRangedBow.class, aiEntry, this.FIELD_G);
	
	if (timeShoot == 40) 
		ReflectionHelper.setPrivateValue(EntityAIAttackRangedBow.class, aiEntry, 100, this.FIELD_G);
}