I'm creatig a mod with these crates that when you punch them they give you items. Right now I use

 

    EntityItem item = new EntityItem(world, i, j, k, new ItemStack(Items.apple, 1));

    world.spawnEntityInWorld(item);

 

to spawn an item, however how can I spawn an item from another mod? like for instance id 4767 from A pack for flans (Modern Weapons) if I do

   

    new ItemStack(4767, 1)

 

it doesn't work, how would I summon an item from another mod? (I'm on 1.7.10)

 

Or if and ONLY IF the ID never changes, feel free to use Item.getItemById(4767).

Can you explain how can the id change?

Any way I can use the name id? (like PandorasBox:PandorasBox)