tooltip&rarity

src/main/java/com/github/ptom76/tutorialfabricmod/item/TutorialItem.java

@@ -1,9 +1,35 @@
 package com.github.ptom76.tutorialfabricmod.item;
 
+import net.minecraft.client.item.TooltipContext;
 import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+import net.minecraft.util.Rarity;
+import net.minecraft.world.World;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
 
 public class TutorialItem extends Item {
     public TutorialItem(Settings settings) {
         super(settings);
     }
+
+    @Override
+    public void appendTooltip(ItemStack stack, @Nullable World world, List<Text> tooltip, TooltipContext context) {
+        super.appendTooltip(stack, world, tooltip, context);
+        // ツールチップ追加
+        // 1.18以前では↓new TranslatableText(key);
+        tooltip.add(Text.translatable("item.tutorialfabricmod.tutorial_item.tooltip").formatted(Formatting.RED));
+
+        // 1.18以前では↓new LiteralText(string);
+        tooltip.add(Text.literal("§dHello, §bWorld!!"));
+    }
+
+    @Override
+    public Rarity getRarity(ItemStack stack) {
+        // レア度
+        return Rarity.UNCOMMON;
+    }
 }

src/main/resources/assets/tutorialfabricmod/lang/en_us.json

@@ -13,6 +13,9 @@
   "block.tutorialfabricmod.tutorial_block": "Tutorial Block",
   "block.tutorialfabricmod.click_count_block": "Click Count Block",
   "block.tutorialfabricmod.blue_apple_generator": "Blue Apple Generator",
+
+  "item.tutorialfabricmod.tutorial_item.tooltip": "The item is blue apple.",
+
   "enchantment.tutorialfabricmod.freeze": "Freeze",
 
   "itemGroup.tutorialfabricmod.tutorial": "Tutorial Mod"