diff --git a/component/src/main/java/com/iluwater/component/App.java b/component/src/main/java/com/iluwater/component/App.java
deleted file mode 100644
index 3a019942f..000000000
--- a/component/src/main/java/com/iluwater/component/App.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * The MIT License
- * Copyright © 2014-2019 Ilkka Seppälä
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-package com.iluwatar.component;
-
-import java.util.ArrayList;
-/**
- * Object-oriented to a certain extent can solve many problems of code reuse and data reuse,
- * but it also has great defects:
- * 1.the coupling of data organization is very strong.
- * 2.Interface logic is difficult to reuse and hot plug.
- *
- * The component pattern solves the defects of object orientation and process orientation and
- * is widely used in game clients
- *
- * A component is a part of one object. We can consider that a object contains multiple
- * components, in another way, multiple components can construct a object.
- * Here is a demo using component pattern to solve a game-like problem.
- * A person named Bjorn who has three components: input;physics;graphics
- * These three component with a common game object can construct our protagonist:Bjorn, also can
- * construct other objects like dog or cat if you want to write a real game.
- */
-
-public class App {
-  /**
-   * Launcher for this demo design pattern
-   */
-  public static void main(String[] args) {
-    ArrayList<Component> arrayList = new ArrayList<>();
-    arrayList.add(new BjornInputComponent());
-    arrayList.add(new BjornPhysicsComponent());
-    arrayList.add(new BjornGraphicsComponent());
-    GameObject gameObject = new GameObject(arrayList);
-    gameObject.update();
-  }
-}