dont know if it works

src/main/java/rip/tilly/bedwars/utils/menusystem/Menu.java

@@ -0,0 +1,63 @@
+package rip.tilly.bedwars.utils.menusystem;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import rip.tilly.bedwars.utils.ItemBuilder;
+
+import java.util.Arrays;
+
+public abstract class Menu implements InventoryHolder {
+
+    protected PlayerMenuUtil playerMenuUtil;
+    protected Inventory inventory;
+    protected ItemStack FILLER_GLASS = new ItemBuilder(Material.STAINED_GLASS_PANE).durability(7).name("").build();
+
+    public Menu(PlayerMenuUtil playerMenuUtil) {
+        this.playerMenuUtil = playerMenuUtil;
+    }
+
+    public abstract String getMenuName();
+
+    public abstract int getSlots();
+
+    public abstract void handleMenu(InventoryClickEvent event);
+
+    public abstract void setMenuItems();
+
+    public void open() {
+        inventory = Bukkit.createInventory(this, getSlots(), getMenuName());
+
+        this.setMenuItems();
+
+        playerMenuUtil.getOwner().openInventory(inventory);
+    }
+
+    @Override
+    public Inventory getInventory() {
+        return inventory;
+    }
+
+    public void setFillerGlass(){
+        for (int i = 0; i < this.getSlots(); i++) {
+            if (this.inventory.getItem(i) == null){
+                this.inventory.setItem(i, this.FILLER_GLASS);
+            }
+        }
+    }
+
+    public ItemStack makeItem(Material material, String displayName, String... lore) {
+        ItemStack item = new ItemStack(material);
+        ItemMeta itemMeta = item.getItemMeta();
+        itemMeta.setDisplayName(displayName);
+
+        itemMeta.setLore(Arrays.asList(lore));
+        item.setItemMeta(itemMeta);
+
+        return item;
+    }
+}