I have added some poop to my mod and I want it to give the player a diamond if they eat it, what code do I need to add to that food class? After I want it to say a custom message in chat which is    "[user] successfully completed the poop eating challenge"      How do I do that as well

Have poop extend ItemFood. Override OnFoodEaten and put these two lines somewhere in that method. Remember that both should only be called serverside.

 

//Drops a diamond at player's position
player.dropItem(Items.diamond, 1);

 

//Broadcasts the message
MinecraftServer.getServer().getConfigurationManager().sendChatMsg(new ChatComponentText(player.getDisplayName() + " successfully completed the poop eating challenge"));

thanks

I keep getting errors on the Override OnFoodEaten? Please could you tell me the way it needs to be coded so I can compare it to mine?

@Override
protected void onFoodEaten(ItemStack item, World world, EntityPlayer player)
{
	super.onFoodEaten(item, world, player);
	if(!world.isRemote){
		player.dropItem(Items.diamond, 1);
		MinecraftServer.getServer().getConfigurationManager().sendChatMsg(new ChatComponentText(player.getDisplayName() + "Successfully did the thing!"));
	}
}

Thanks, does the chat automatically say the players username?

If you can't tell that by glancing at that I would advise that you search online for java tutorials. There's lots of free resources available.

I know Java, I realised that it did straight after I posted the other comment