CatEvents.java

package com.tinkeracademy.minecraft;

import net.minecraft.client.Minecraft;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Items;
import net.minecraft.item.ItemStack;
import net.minecraftforge.event.entity.EntityEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

public class CatEvents {

	@SubscribeEvent
	public void init(EntityEvent event) {
		if (event.entity instanceof Cat) {
			Cat cat = (Cat) event.entity;
			if (!cat.following) {
				EntityPlayer player = Minecraft.getMinecraft().thePlayer;
				ItemStack itemStack = player.inventory.getCurrentItem();
				if (itemStack.getItem() == Items.nether_star) {
					cat.followPlayer();
				}
			}
		}
	}
	
}