add design pattern decorator

Author: yzqdev

.github/workflows/deploy_gh_pages.yml

@@ -21,7 +21,8 @@ jobs:
 
       - name: 设置 pnpm
         uses: pnpm/action-setup@v4
-
+        with:
+          version: 10
 
       - name: 设置 Node.js
         uses: actions/setup-node@v4

docs/java-tutor/design-pattern/decorator.md

@@ -0,0 +1,73 @@
+# 装饰器模式
+
+```java
+
+@Slf4j
+class DecoratorPatternTest {
+  @Test
+  void test() {
+    Tiger tiger = new Tiger();
+    Living flyDecorator = new ThrowStoneDecorator(new FlyDecorator(tiger));
+    flyDecorator.behave();
+  }
+}
+
+interface Living {
+  void behave();
+}
+
+class Tiger implements Living {
+
+
+  @Override
+  public void behave() {
+    System.out.println("tiger behave");
+  }
+}
+
+class Bird implements Living {
+  @Override
+  public void behave() {
+    System.out.println("bird behave");
+  }
+}
+
+abstract class LivingDecorator implements Living {
+  Living living;
+
+  public LivingDecorator(Living living) {
+    this.living = living;
+  }
+
+  @Override
+  public void behave() {
+    this.living.behave();
+  }
+}
+
+class FlyDecorator extends LivingDecorator {
+
+  public FlyDecorator(Living living) {
+    super(living);
+  }
+
+  @Override
+  public void behave() {
+    super.behave();
+    System.out.println("i can fly");
+  }
+}
+
+class ThrowStoneDecorator extends LivingDecorator {
+  public ThrowStoneDecorator(Living living) {
+    super(living);
+  }
+
+  @Override
+  public void behave() {
+    super.behave();
+    System.out.println("i can throw stone");
+  }
+}
+
+```