Bukkit

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this.ejectItem(item); //item being an ItemStack Object
//This method is preferred to ejecting/dropping items with your own code as this can be hooked into by other developers using the API

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@EventHandler
public void onMachineEjectItem(MachineEjectItemEvent event) {
    ItemStack item = event.getItem();

    //Because we obviously don't want our machine throwing out TNT blocks :3
    if(item.getType() == Material.TNT) {
        event.setCancelled(true);
    }
}
//This is useful in case you would like to do something with the items a machine is dropping rather than just have it drop onto the ground

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Set<ItemStack> drops = this.getBlockDrops(facingBlock);
//This is preffered to block.getDrops() as this will also get blocks from inventory and get the proper drop item for machines
//For use in classes that extend MachineBlock

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this.addItemToBlock(block, item, ejectItem);
//Will always return a Set of items that didn't fit
//Will try and add the item to the blocks inventory, if not, and if ejectItem is true, it will call this.ejectItem() on the ItemStack
//For use in classes that extend MachineBlock

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this.setInventory(inventoryname, inventorysize);
//This will create your machine's inventory with the name and size specified

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Inventory inventory = this.getInventory();
//Will grab the machines inventory