Rename GenericItem to T (FabricMC#510)

Co-authored-by: Miroma <its.miroma@proton.me>

Author: CelDaemon

develop/items/first-item.md

@@ -24,7 +24,7 @@ Mojang does this with their items as well! Check out the `Items` class for inspi
 
 @[code transcludeWith=:::1](@/reference/latest/src/main/java/com/example/docs/item/ModItems.java)
 
-Notice how we're using a `GenericItem`, which allows us to use the same method `register` for registering any type of item that extends `Item`. We're also using a [`Function`](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/function/Function.html) interface for the factory, which allows us to specify how we want our item to be created given the item properties.
+Notice how we're using `T`, a [generic type](https://docs.oracle.com/javase/tutorial/java/generics/types.html) that extends `Item`. This allows us to use the same method `register` for registering any type of item that extends `Item`. We're also using a [`Function`](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/function/Function.html) for the factory, which allows us to specify how we want our item to be created given the item properties.
 
 ## Registering an Item {#registering-an-item}
 

reference/1.21.10/src/main/java/com/example/docs/item/ModItems.java

@@ -160,12 +160,12 @@ public InteractionResult use(Level world, Player user, InteractionHand hand) {
 	public static final Item THROWING_KNIVES = register("throwing_knives", Item::new, new Item.Properties().stacksTo(3));
 
 	// :::1
-	public static <GenericItem extends Item> GenericItem register(String name, Function<Item.Properties, GenericItem> itemFactory, Item.Properties settings) {
+	public static <T extends Item> T register(String name, Function<Item.Properties, T> itemFactory, Item.Properties settings) {
 		// Create the item key.
 		ResourceKey<Item> itemKey = ResourceKey.create(Registries.ITEM, ResourceLocation.fromNamespaceAndPath(ExampleMod.MOD_ID, name));
 
 		// Create the item instance.
-		GenericItem item = itemFactory.apply(settings.setId(itemKey));
+		T item = itemFactory.apply(settings.setId(itemKey));
 
 		// Register the item.
 		Registry.register(BuiltInRegistries.ITEM, itemKey, item);

reference/latest/src/main/java/com/example/docs/item/ModItems.java

@@ -198,12 +198,12 @@ public InteractionResult use(Level level, Player user, InteractionHand hand) {
 	public static final Item THROWING_KNIVES = register("throwing_knives", Item::new, new Item.Properties().stacksTo(3));
 
 	// :::1
-	public static <GenericItem extends Item> GenericItem register(String name, Function<Item.Properties, GenericItem> itemFactory, Item.Properties settings) {
+	public static <T extends Item> T register(String name, Function<Item.Properties, T> itemFactory, Item.Properties settings) {
 		// Create the item key.
 		ResourceKey<Item> itemKey = ResourceKey.create(Registries.ITEM, Identifier.fromNamespaceAndPath(ExampleMod.MOD_ID, name));
 
 		// Create the item instance.
-		GenericItem item = itemFactory.apply(settings.setId(itemKey));
+		T item = itemFactory.apply(settings.setId(itemKey));
 
 		// Register the item.
 		Registry.register(BuiltInRegistries.ITEM, itemKey, item);