提升代码质量

src/main/java/com/mmlsystem/CheckinSystem/CheckinCommand.java

@@ -23,7 +23,7 @@ public class CheckinCommand implements CommandExecutor {
         Player player = (Player) sender;
 
         player.sendMessage("§b签到中，请稍候...");
-        manager.checkinAsync(player, message -> player.sendMessage(message));
+        manager.checkinAsync(player, player::sendMessage);
         return true;
     }
 }