java设计模式

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/strategy/StrategyPatternDemo.java

@@ -11,6 +11,7 @@ public class StrategyPatternDemo {
         System.out.println("10 + 5 = " + context.executeStrategy(10, 5));
         context.SetStrategy(new OperationSubstract());
         System.out.println("10 - 5 = " + context.executeStrategy(10, 5));
-        context.SetStrategy(new OperationMultiply());          System.out.println("10 * 5 = " + context.executeStrategy(10, 5));
+        context.SetStrategy(new OperationMultiply());
+        System.out.println("10 * 5 = " + context.executeStrategy(10, 5));
     }
 }

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/template/Cricket.java

+package cn.datax.learning.design.patterns.behavioral.template;
+
+public class Cricket extends Game {
+
+    @Override
+    void endPlay() {
+        System.out.println("Cricket Game Finished!");
+    }
+
+    @Override
+    void initialize() {
+        System.out.println("Cricket Game Initialized! Start playing.");
+    }
+
+    @Override
+    void startPlay() {
+        System.out.println("Cricket Game Started. Enjoy the game!");
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/template/Football.java

+package cn.datax.learning.design.patterns.behavioral.template;
+
+public class Football extends Game {
+
+    @Override
+    void endPlay() {
+        System.out.println("Football Game Finished!");
+    }
+
+    @Override
+    void initialize() {
+        System.out.println("Football Game Initialized! Start playing.");
+    }
+
+    @Override
+    void startPlay() {
+        System.out.println("Football Game Started. Enjoy the game!");
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/template/Game.java

+package cn.datax.learning.design.patterns.behavioral.template;
+
+public abstract class Game {
+
+    abstract void initialize();
+
+    abstract void startPlay();
+
+    abstract void endPlay();
+
+    //模板
+    public final void play() {
+
+        //初始化游戏
+        initialize();
+
+        //开始游戏
+        startPlay();
+
+        //结束游戏
+        endPlay();
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/template/TemplatePatternDemo.java

+package cn.datax.learning.design.patterns.behavioral.template;
+
+/**
+ * 模板模式（Template Pattern）
+ */
+public class TemplatePatternDemo {
+
+    public static void main(String[] args) {
+        Game game = new Cricket();
+        game.play();
+        System.out.println();
+        game = new Football();
+        game.play();
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/Computer.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+public class Computer implements ComputerPart {
+
+    ComputerPart[] parts;
+
+    public Computer() {
+        parts = new ComputerPart[] {new Mouse(), new Keyboard(), new Monitor()};
+    }
+
+
+    @Override
+    public void accept(ComputerPartVisitor computerPartVisitor) {
+        for (int i = 0; i < parts.length; i++) {
+            parts[i].accept(computerPartVisitor);
+        }
+        computerPartVisitor.visit(this);
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/ComputerPart.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+public interface ComputerPart {
+
+    public void accept(ComputerPartVisitor computerPartVisitor);
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/ComputerPartDisplayVisitor.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+public class ComputerPartDisplayVisitor implements ComputerPartVisitor {
+
+    @Override
+    public void visit(Computer computer) {
+        System.out.println("Displaying Computer.");
+    }
+
+    @Override
+    public void visit(Mouse mouse) {
+        System.out.println("Displaying Mouse.");
+    }
+
+    @Override
+    public void visit(Keyboard keyboard) {
+        System.out.println("Displaying Keyboard.");
+    }
+
+    @Override
+    public void visit(Monitor monitor) {
+        System.out.println("Displaying Monitor.");
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/ComputerPartVisitor.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+public interface ComputerPartVisitor {
+
+    public void visit(Computer computer);
+
+    public void visit(Mouse mouse);
+
+    public void visit(Keyboard keyboard);
+
+    public void visit(Monitor monitor);
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/Keyboard.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+public class Keyboard implements ComputerPart {
+
+    @Override
+    public void accept(ComputerPartVisitor computerPartVisitor) {
+        computerPartVisitor.visit(this);
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/Monitor.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+public class Monitor implements ComputerPart {
+
+    @Override
+    public void accept(ComputerPartVisitor computerPartVisitor) {
+        computerPartVisitor.visit(this);
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/Mouse.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+public class Mouse implements ComputerPart {
+
+    @Override
+    public void accept(ComputerPartVisitor computerPartVisitor) {
+        computerPartVisitor.visit(this);
+    }
+}

datax-learning/design-patterns/src/main/java/cn/datax/learning/design/patterns/behavioral/visitor/VisitorPatternDemo.java

+package cn.datax.learning.design.patterns.behavioral.visitor;
+
+/**
+ * 访问者模式（Visitor Pattern）
+ */
+public class VisitorPatternDemo {
+
+    public static void main(String[] args) {
+        ComputerPart computer = new Computer();
+        computer.accept(new ComputerPartDisplayVisitor());
+    }
+}