Create App.java

component/src/main/java/com/iluwatar/component/App.java

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+/*
+ * 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();
+  }
+}