inventory

inventory.java

Player player;

ItemStack myItemStack = ItemStacks.builder().itemType(ItemType.PLANKS).dataValue(3);

// used by player and crafting table -- has matrix and result
CraftingInventory crafting = player.getInventory().getCraftingInventory();

// the 'input' to the crafting inventory
// it is a grid of items
ItemGrid matrix = crafting.getMatrix();

// _ *
// _ _
matrix.setContents(1, 0, itemStack);

matrix.setContents(new Vector2i(1, 0), itemStack);

// a single item slot
ItemSingle result = crafting.getResult():

// we can also use the old, indexed way way
player.getInventory().setContents(2, itemStack);