《Head First设计模式》阅读笔记.第七章

臧圩人

OVER！

臧圩人

补充一个新的外观（Facade）模式实例，比上一个例子更能突出这个模式的优点。
示例代码如下：

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// 电源
public class Power {
        public void connect() {
                System.out.println("The power is connected.");
        }

        public void disconnect() {
                System.out.println("The power is disconnected.");
        }
}

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// 主板
public class MainBoard {
        public void on() {
                System.out.println("The mainboard is on.");
        }

        public void off() {
                System.out.println("The mainboard is off.");
        }
}

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// 硬盘
public class HardDisk {
        public void run() {
                System.out.println("The harddisk is running.");
        }

        public void stop() {
                System.out.println("The harddisk is stopped.");
        }
}

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// 操作系统
public class OperationSystem {
        public void startup() {
                System.out.println("The opertion system is startup.");
        }

        public void shutdown() {
                System.out.println("The operation system is shutdown.");
        }
}

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// 计算机外观
public class Computer {
        private Power power;

        private MainBoard board;

        private HardDisk disk;

        private OperationSystem system;

        public Computer(Power power, MainBoard board, HardDisk disk, OperationSystem system) {
                this.power = power;
                this.board = board;
                this.disk = disk;
                this.system = system;
        }

        public void startup() {
                this.power.connect();
                this.board.on();
                this.disk.run();
                this.system.startup();
        }

        public void shutdown() {
                this.system.shutdown();
                this.disk.stop();
                this.board.off();
                this.power.disconnect();
        }
}

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// 测试计算机外观类
public class TestComputer {
        public static void main(String[] args) {
                Power power = new Power();
                MainBoard board = new MainBoard();
                HardDisk disk = new HardDisk();
                OperationSystem system = new OperationSystem();

                Computer computer = new Computer(power, board, disk, system);
                computer.startup();
                computer.shutdown();
        }
}

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测试结果：

The power is connected.
The mainboard is on.
The harddisk is running.
The opertion system is startup.
The operation system is shutdown.
The harddisk is stopped.
The mainboard is off.
The power is disconnected.

--END--

justforregister

nice job