public class InnerClassSingleton {
    /**
     * 基于类初始化
     */
    private static class InstanceHolder {
        public static InnerClassSingleton instance = new InnerClassSingleton();
    }
    public static InnerClassSingleton getInstance() {
        return InstanceHolder.instance;
    }
}

public class DoubleCheckSingleton {
    private static volatile DoubleCheckSingleton instance;
	
    private DoubleCheckSingleton() {}

    //提供一个静态的公有方法，加入双重检查代码，解决线程安全问题, 同时解决懒加载问题
    //同时保证了效率, 推荐使用
    public static DoubleCheckSingleton getInstance() {
        if(instance == null) {
            synchronized (DoubleCheckSingleton.class) {
                if(instance == null) {
                    instance = new DoubleCheckSingleton();
                }
            }
            
        }
        return instance;
    }
}

 //使用枚举，可以实现单例, 推荐
public enum Singleton {
    INSTANCE; //属性
    public Singleton getInstance() {
        return Singleton.INSTANCE;
    }
}

class DeepCloneableTarget implements Serializable, Cloneable {

    private static final long serialVersionUID = 1L;

    private String cloneName;

    private String cloneClass;

    //构造器
    public DeepCloneableTarget(String cloneName, String cloneClass) {
        this.cloneName = cloneName;
        this.cloneClass = cloneClass;
    }

    //因为该类的属性，都是String , 因此我们这里使用默认的clone完成即可
    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}
public class DeepProtoType implements Serializable, Cloneable{

    public String name; //String 属性
    public DeepCloneableTarget deepCloneableTarget;// 引用类型
    public DeepProtoType() {
        super();
    }


    //深拷贝 - 方式 1 使用clone 方法
    @Override
    protected Object clone() throws CloneNotSupportedException {

        Object deep = null;
        //这里完成对基本数据类型(属性)和String的克隆
        deep = super.clone();
        //对引用类型的属性，进行单独处理
        DeepProtoType deepProtoType = (DeepProtoType)deep;
        deepProtoType.deepCloneableTarget  = (DeepCloneableTarget)deepCloneableTarget.clone();

        // TODO Auto-generated method stub
        return deepProtoType;
    }

    //深拷贝 - 方式2 通过对象的序列化实现 (推荐)

    public Object deepClone() {

        //创建流对象
        ByteArrayOutputStream bos = null;
        ObjectOutputStream oos = null;
        ByteArrayInputStream bis = null;
        ObjectInputStream ois = null;

        try {

            //序列化
            bos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(bos);
            oos.writeObject(this); //当前这个对象以对象流的方式输出

//            oos = new ObjectOutputStream(new ByteArrayOutputStream());

            //反序列化
            bis = new ByteArrayInputStream(bos.toByteArray());
            ois = new ObjectInputStream(bis);
//            ois = new ObjectInputStream(new ByteArrayInputStream(bos.toByteArray()));
            DeepProtoType copyObj = (DeepProtoType)ois.readObject();

            return copyObj;

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            return null;
        } finally {
            //关闭流
            try {
                bos.close();
                oos.close();
                bis.close();
                ois.close();
            } catch (Exception e2) {
                // TODO: handle exception
                System.out.println(e2.getMessage());
            }
        }
    }
}

//适配器类
public class VoltageAdapter  implements IVoltage5V {

    private Voltage220V voltage220V; // 关联关系-聚合

    //通过构造器，传入一个 Voltage220V 实例
    public VoltageAdapter(Voltage220V voltage220v) {
        this.voltage220V = voltage220v;
    }

    @Override
    public int output5V() {

        int dst = 0;
        if(null != voltage220V) {
            int src = voltage220V.output220V();//获取220V 电压
            System.out.println("使用对象适配器，进行适配~~");
            dst = src / 44;
            System.out.println("适配完成，输出的电压为=" + dst);
        }
        return dst;
    }

}
//适配接口
interface IVoltage5V {
    public int output5V();
}

//被适配的类
class Voltage220V {
    //输出220V的电压，不变
    public int output220V() {
        int src = 220;
        System.out.println("电压=" + src + "伏");
        return src;
    }
}
class Phone {

    //充电
    public void charging(IVoltage5V iVoltage5V) {
        if(iVoltage5V.output5V() == 5) {
            System.out.println("电压为5V, 可以充电~~");
        } else if (iVoltage5V.output5V() > 5) {
            System.out.println("电压大于5V, 不能充电~~");
        }
    }
}

interface Command {
    public void execute();
    public void undo();
}
public class NoCommand implements Command {

    @Override
    public void execute() {
        // TODO Auto-generated method stub

    }

    @Override
    public void undo() {
        // TODO Auto-generated method stub

    }

}
public class LightReceiver {

    public void on() {
        System.out.println(" 电灯打开了.. ");
    }

    public void off() {
        System.out.println(" 电灯关闭了.. ");
    }
}
class LightOffCommand implements Command {

    // 聚合LightReceiver
    LightReceiver light;

    // 构造器
    public LightOffCommand(LightReceiver light) {
        super();
        this.light = light;
    }

    @Override
    public void execute() {
        // TODO Auto-generated method stub
        // 调用接收者的方法
        light.off();
    }

    @Override
    public void undo() {
        // TODO Auto-generated method stub
        // 调用接收者的方法
        light.on();
    }
}
class LightOnCommand implements Command {

    //聚合LightReceiver
    LightReceiver light;

    //构造器
    public LightOnCommand(LightReceiver light) {
        super();
        this.light = light;
    }

    @Override
    public void execute() {
        // TODO Auto-generated method stub
        //调用接收者的方法
        light.on();
    }

    @Override
    public void undo() {
        // TODO Auto-generated method stub
        //调用接收者的方法
        light.off();
    }
}
public class RemoteController {

    // 开 按钮的命令数组
    Command[] onCommands;
    Command[] offCommands;

    // 执行撤销的命令
    Command undoCommand;

    // 构造器，完成对按钮初始化

    public RemoteController() {

        onCommands = new Command[5];
        offCommands = new Command[5];

        for (int i = 0; i < 5; i++) {
            onCommands[i] = new NoCommand();
            offCommands[i] = new NoCommand();
        }
    }

    // 给我们的按钮设置你需要的命令
    public void setCommand(int no, Command onCommand, Command offCommand) {
        onCommands[no] = onCommand;
        offCommands[no] = offCommand;
    }

    // 按下开按钮
    public void onButtonWasPushed(int no) { // no 0
        // 找到你按下的开的按钮， 并调用对应方法
        onCommands[no].execute();
        // 记录这次的操作，用于撤销
        undoCommand = onCommands[no];

    }

    // 按下开按钮
    public void offButtonWasPushed(int no) { // no 0
        // 找到你按下的关的按钮， 并调用对应方法
        offCommands[no].execute();
        // 记录这次的操作，用于撤销
        undoCommand = offCommands[no];

    }

    // 按下撤销按钮
    public void undoButtonWasPushed() {
        undoCommand.undo();
    }
}