strategy

Author: code4craft

src/main/java/helloworld/Main.java

@@ -14,6 +14,8 @@
 import helloworld.behavioral.observer.HelloWorldObserver;
 import helloworld.behavioral.observer.Subject;
 import helloworld.behavioral.state.HelloWorldStateContext;
+import helloworld.behavioral.strategy.DesignPatternHelloWorldStrategy;
+import helloworld.behavioral.strategy.HelloWorldStrategyContext;
 import helloworld.creational.abstract_factory.AbstractFactory;
 import helloworld.creational.abstract_factory.SplitHelloWorldFactory;
 import helloworld.creational.builder.HelloWorldBuilder;
@@ -124,5 +126,8 @@ public static void main(String[] args) throws InstantiationException, IllegalAcc
         HelloWorld stateHelloWorld = helloWorldStateContext.appendWord("Hello").appendWord("State");
         System.out.println(stateHelloWorld.helloWorld());
 
+        HelloWorldStrategyContext helloWorldStrategyContext = new HelloWorldStrategyContext(new DesignPatternHelloWorldStrategy());
+        System.out.println(helloWorldStrategyContext.helloWorld());
+
     }
 }

src/main/java/helloworld/behavioral/strategy/DesignPatternHelloWorldStrategy.java

@@ -0,0 +1,11 @@
+package helloworld.behavioral.strategy;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class DesignPatternHelloWorldStrategy implements HelloWorldStrategy{
+    @Override
+    public String helloWorld() {
+        return "Hello Strategy!";
+    }
+}

src/main/java/helloworld/behavioral/strategy/HelloWorldStrategy.java

@@ -0,0 +1,9 @@
+package helloworld.behavioral.strategy;
+
+import helloworld.HelloWorld;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public interface HelloWorldStrategy extends HelloWorld {
+}

src/main/java/helloworld/behavioral/strategy/HelloWorldStrategyContext.java

@@ -0,0 +1,20 @@
+package helloworld.behavioral.strategy;
+
+import helloworld.HelloWorld;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class HelloWorldStrategyContext implements HelloWorld{
+
+    private HelloWorldStrategy helloWorldStrategy;
+
+    public HelloWorldStrategyContext(HelloWorldStrategy helloWorldStrategy) {
+        this.helloWorldStrategy = helloWorldStrategy;
+    }
+
+    @Override
+    public String helloWorld() {
+        return helloWorldStrategy.helloWorld();
+    }
+}

src/main/java/helloworld/behavioral/strategy/JavaHelloWorldStrategy.java

@@ -0,0 +1,11 @@
+package helloworld.behavioral.strategy;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class JavaHelloWorldStrategy implements HelloWorldStrategy{
+    @Override
+    public String helloWorld() {
+        return "Hello Java!";
+    }
+}

src/main/java/helloworld/behavioral/strategy/StrategyHelloWorld.java

@@ -0,0 +1,20 @@
+package helloworld.behavioral.strategy;
+
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class HelloWorldStrategyContextTest {
+
+    @Test
+    public void testHelloWorldStrategyContext(){
+        HelloWorldStrategyContext helloWorldStrategyContext = new HelloWorldStrategyContext(new JavaHelloWorldStrategy());
+        assertThat(helloWorldStrategyContext.helloWorld(),is("Hello Java!"));
+        helloWorldStrategyContext = new HelloWorldStrategyContext(new DesignPatternHelloWorldStrategy());
+        assertThat(helloWorldStrategyContext.helloWorld(),is("Hello Strategy!"));
+    }
+}