设计模式-适配器模式，备忘录模式

Author: dolyw

DesignPattern/src/main/java/com/design/adapter/BankAdapter.java

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+package com.design.adapter;
+
+/**
+ * 银行适配器
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/1 10:40
+ */
+public class BankAdapter {
+
+    public Rmb changeRmbMoney(Dollar dollar) {
+        return new Rmb(dollar.getAmount() * 7);
+    }
+
+}

DesignPattern/src/main/java/com/design/adapter/Dollar.java

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+package com.design.adapter;
+
+/**
+ * 美元
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/1 10:40
+ */
+public class Dollar {
+
+    private int amount;
+
+    public Dollar(int amount) {
+        this.amount = amount;
+    }
+
+    public int getAmount() {
+        return amount;
+    }
+}

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

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+package com.design.adapter;
+
+/**
+ * 适配器模式是作为两个不兼容的接口之间的桥梁
+ * 将一个类的接口转换为期望的另一个接口，使原本不兼容的类可以一起工作
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/1 10:37
+ */
+public class Main {
+
+    public static void main(String[] args) {
+        // 商店购买只能使用人民币
+        Shop shop = new Shop();
+        Rmb rmb = new Rmb(100);
+        // 购买成功
+        shop.buy(rmb);
+        System.out.println("------------");
+        // 现在有美元无法购买
+        Dollar dollar = new Dollar(10);
+        // shop.buy(dollar);
+        // 使用银行适配器完成
+        BankAdapter bankAdapter = new BankAdapter();
+        shop.buy(bankAdapter.changeRmbMoney(dollar));
+    }
+
+}

DesignPattern/src/main/java/com/design/adapter/Rmb.java

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+package com.design.adapter;
+
+/**
+ * 人民币
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/1 10:40
+ */
+public class Rmb {
+
+    private int amount;
+
+    public Rmb(int amount) {
+        this.amount = amount;
+    }
+
+    public int getAmount() {
+        return amount;
+    }
+}

DesignPattern/src/main/java/com/design/adapter/Shop.java

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+package com.design.adapter;
+
+/**
+ * 商店
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/1 11:08
+ */
+public class Shop {
+
+    public void buy(Rmb rmb) {
+        System.out.println("购买成功，消费" + rmb.getAmount() + "元人民币");
+    }
+
+}

DesignPattern/src/main/java/com/design/memento/GameCareTaker.java

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+package com.design.memento;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 游戏记录管理
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/2 10:45
+ */
+public class GameCareTaker {
+
+    private List<GameMemento> gameMementoList = new ArrayList<>();
+
+    public void add(GameMemento gameMemento){
+        gameMementoList.add(gameMemento);
+    }
+
+    public GameMemento get(int index){
+        return gameMementoList.get(index);
+    }
+
+}

DesignPattern/src/main/java/com/design/memento/GameMemento.java

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+package com.design.memento;
+
+/**
+ * 游戏记录
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/2 10:45
+ */
+public class GameMemento {
+
+    private String state;
+
+    public GameMemento(String state){
+        this.state = state;
+    }
+
+    public String getState(){
+        return state;
+    }
+
+}

DesignPattern/src/main/java/com/design/memento/GameOriginator.java

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+package com.design.memento;
+
+/**
+ * 当前游戏状态
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/2 10:45
+ */
+public class GameOriginator {
+
+    private String state;
+
+    public GameOriginator(String state) {
+        this.state = state;
+    }
+
+    public void setState(String state){
+        this.state = state;
+    }
+
+    public String getState(){
+        return state;
+    }
+
+    public GameMemento saveMemento(){
+        return new GameMemento(state);
+    }
+
+    public void getFromMemento(GameMemento gameMemento){
+        state = gameMemento.getState();
+    }
+
+}

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

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+package com.design.memento;
+
+/**
+ * 备忘录模式 - 游戏存档，浏览器历史记录
+ *
+ * @author wliduo[i@dolyw.com]
+ * @date 2023/2/2 10:45
+ */
+public class Main {
+
+    public static void main(String[] args) {
+        GameCareTaker gameCareTaker = new GameCareTaker();
+        // 开始游戏
+        GameOriginator gameOriginator = new GameOriginator("1# 你出生了，你正在新手村出生位置");
+        System.out.println(gameOriginator.getState());
+        // 游戏存档
+        gameCareTaker.add(gameOriginator.saveMemento());
+        gameOriginator.setState("2# 去找村长对话");
+        System.out.println(gameOriginator.getState());
+        // 游戏存档
+        gameCareTaker.add(gameOriginator.saveMemento());
+        gameOriginator.setState("3# 获得任务，杀死史莱姆");
+        System.out.println(gameOriginator.getState());
+        // 游戏读取存档
+        gameOriginator.getFromMemento(gameCareTaker.get(1));
+        System.out.println(gameOriginator.getState());
+        // 游戏读取存档
+        gameOriginator.getFromMemento(gameCareTaker.get(0));
+        System.out.println(gameOriginator.getState());
+    }
+
+}