设计模式-装饰器模式

Author: dolyw

DesignPattern/src/main/java/com/design/decorator/Main.java

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+package com.design.decorator;
+
+import com.design.decorator.component.FryNoodleConcreteComponent;
+import com.design.decorator.component.NoodleComponent;
+import com.design.decorator.component.SoupNoodleConcreteComponent;
+import com.design.decorator.decorator.BeefConcreteDecorator;
+import com.design.decorator.decorator.FriedEggConcreteDecorator;
+import com.design.decorator.decorator.MarinatedEggConcreteDecorator;
+
+/**
+ * 装饰器模式
+ * 通过不同的装饰器自由组合
+ * 我们可以灵活的组装出各式各样的面加配菜
+ * 这正是装饰者模式的优点
+ * 但明显可以看出代码变复杂了
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:05
+ */
+public class Main {
+
+    public static void main(String[] args) {
+        // 汤面
+        NoodleComponent soupNoodleConcreteComponent = new SoupNoodleConcreteComponent();
+        // 加牛肉
+        soupNoodleConcreteComponent = new BeefConcreteDecorator(soupNoodleConcreteComponent);
+        // 加煎蛋
+        soupNoodleConcreteComponent = new FriedEggConcreteDecorator(soupNoodleConcreteComponent);
+        System.out.println(soupNoodleConcreteComponent.remark());
+        System.out.println(soupNoodleConcreteComponent.price());
+        System.out.println("----------------------");
+        // 炒面
+        NoodleComponent fryNoodleConcreteComponent = new FryNoodleConcreteComponent();
+        // 加牛肉
+        fryNoodleConcreteComponent = new BeefConcreteDecorator(fryNoodleConcreteComponent);
+        // 加卤蛋
+        fryNoodleConcreteComponent = new MarinatedEggConcreteDecorator(fryNoodleConcreteComponent);
+        System.out.println(fryNoodleConcreteComponent.remark());
+        System.out.println(fryNoodleConcreteComponent.price());
+        System.out.println("-----------------------");
+        // 炒面
+        NoodleComponent fryNoodleConcreteComponentEasy = new FryNoodleConcreteComponent();
+        // 加牛肉加卤蛋加煎蛋
+        fryNoodleConcreteComponentEasy =
+                new BeefConcreteDecorator(
+                        new MarinatedEggConcreteDecorator(new FriedEggConcreteDecorator(fryNoodleConcreteComponentEasy)));
+        System.out.println(fryNoodleConcreteComponentEasy.remark());
+        System.out.println(fryNoodleConcreteComponentEasy.price());
+    }
+
+}

DesignPattern/src/main/java/com/design/decorator/component/FryNoodleConcreteComponent.java

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+package com.design.decorator.component;
+
+/**
+ * 炒面具体构件
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:30
+ */
+public class FryNoodleConcreteComponent implements NoodleComponent {
+
+    @Override
+    public String remark() {
+        return "炒面10快";
+    }
+
+    @Override
+    public Integer price() {
+        return 10;
+    }
+}

DesignPattern/src/main/java/com/design/decorator/component/NoodleComponent.java

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+package com.design.decorator.component;
+
+/**
+ * 面条抽象构件
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:30
+ */
+public interface NoodleComponent {
+
+    /**
+     * 备注
+     *
+     * @param
+     * @return java.lang.String
+     * @throws
+     * @author wliduo[i@dolyw.com]
+     * @date 2022/1/18 16:31
+     */
+    String remark();
+
+    /**
+     * 价格
+     *
+     * @param
+     * @return java.lang.Integer
+     * @throws
+     * @author wliduo[i@dolyw.com]
+     * @date 2022/1/18 16:31
+     */
+    Integer price();
+
+}

DesignPattern/src/main/java/com/design/decorator/component/SoupNoodleConcreteComponent.java

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+package com.design.decorator.component;
+
+/**
+ * 汤面具体构件
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:30
+ */
+public class SoupNoodleConcreteComponent implements NoodleComponent {
+
+    @Override
+    public String remark() {
+        return "汤面8快";
+    }
+
+    @Override
+    public Integer price() {
+        return 8;
+    }
+}

DesignPattern/src/main/java/com/design/decorator/decorator/AbstractSideDishDecorator.java

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+package com.design.decorator.decorator;
+
+import com.design.decorator.component.NoodleComponent;
+
+/**
+ * 配菜抽象装饰
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:40
+ */
+public abstract class AbstractSideDishDecorator implements NoodleComponent {
+
+    private NoodleComponent noodleComponent;
+
+    public AbstractSideDishDecorator(NoodleComponent noodleComponent) {
+        this.noodleComponent = noodleComponent;
+    }
+
+    @Override
+    public String remark() {
+        return noodleComponent.remark();
+    }
+
+    @Override
+    public Integer price() {
+        return noodleComponent.price();
+    }
+}

DesignPattern/src/main/java/com/design/decorator/decorator/BeefConcreteDecorator.java

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+package com.design.decorator.decorator;
+
+import com.design.decorator.component.NoodleComponent;
+
+/**
+ * 牛肉具体装饰
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:44
+ */
+public class BeefConcreteDecorator extends AbstractSideDishDecorator {
+
+    public BeefConcreteDecorator(NoodleComponent noodleComponent) {
+        super(noodleComponent);
+    }
+
+    @Override
+    public String remark() {
+        return super.remark() + " 加份牛肉5快";
+    }
+
+    @Override
+    public Integer price() {
+        return super.price() + 5;
+    }
+}

DesignPattern/src/main/java/com/design/decorator/decorator/FriedEggConcreteDecorator.java

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+package com.design.decorator.decorator;
+
+import com.design.decorator.component.NoodleComponent;
+
+/**
+ * 煎蛋具体装饰
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:44
+ */
+public class FriedEggConcreteDecorator extends AbstractSideDishDecorator {
+
+    public FriedEggConcreteDecorator(NoodleComponent noodleComponent) {
+        super(noodleComponent);
+    }
+
+    @Override
+    public String remark() {
+        return super.remark() + " 加份煎蛋3快";
+    }
+
+    @Override
+    public Integer price() {
+        return super.price() + 3;
+    }
+}

DesignPattern/src/main/java/com/design/decorator/decorator/MarinatedEggConcreteDecorator.java

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+package com.design.decorator.decorator;
+
+import com.design.decorator.component.NoodleComponent;
+
+/**
+ * 卤蛋具体装饰
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2022/1/18 16:44
+ */
+public class MarinatedEggConcreteDecorator extends AbstractSideDishDecorator {
+
+    public MarinatedEggConcreteDecorator(NoodleComponent noodleComponent) {
+        super(noodleComponent);
+    }
+
+    @Override
+    public String remark() {
+        return super.remark() + " 加份卤蛋2快";
+    }
+
+    @Override
+    public Integer price() {
+        return super.price() + 2;
+    }
+}