ModItemGroups.java

package com.anonymusdennis.annomod.init;

import com.anonymusdennis.annomod.annomod;
import net.minecraft.item.Item;
import net.minecraft.item.ItemGroup;
import net.minecraft.item.ItemStack;
import net.minecraft.item.Items;
import net.minecraft.util.NonNullList;
import net.minecraft.util.registry.Registry;
import java.util.function.Supplier;

public class ModItemGroups  {
    public static class ModItemGroup extends ItemGroup {

        private final Supplier<ItemStack> iconSupplier;

        public ModItemGroup(final String name, final Supplier<ItemStack> iconSupplier) {
            super(name);
            this.iconSupplier = iconSupplier;
        }

        @Override
        public ItemStack createIcon() {
            return iconSupplier.get();
        }
        @Override
        public void fill(NonNullList<ItemStack> items) {
            for(Item item : Registry.ITEM) {
                item.fillItemGroup(this, items);
            }
        }
    }
    public static final ItemGroup MOD_ITEM_GROUP_Banner = new ModItemGroup("jolo", () -> new ItemStack(Items.LIGHT_BLUE_BANNER));
    public static ItemGroup MOD_ITEM_GROUP_Skulls = (new ModItemGroup("Heads", () -> new ItemStack(Items.LIGHT_BLUE_BANNER)));
    public static final ItemGroup MOD_ITEM_GROUP_Standart = new ModItemGroup(annomod.MOD_ID, () -> new ItemStack(ItemInit.erstes_item));
    public static final ItemGroup MOD_ITEM_GROUP_Rest = new ModItemGroup("Rest", () -> new ItemStack(Items.LIGHT_BLUE_BANNER));

}