Java 深入探讨设计模式之原型模式篇

public class Sheep {
	private String name;
	private int age;
	private String color;
	public Sheep(String name, int age, String color) {
		super();
		this.name = name;
		this.age = age;
		this.color = color;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	@Override
	public String toString() {
		return "Sheep [name=" + name + ", age=" + age + ", color=" + color + "]";
	}
	
	
}

public class Client {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//传统方法
		Sheep sheep = new Sheep("tom", 1, "白色  ");
		
		Sheep sheep2 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		Sheep sheep3 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		Sheep sheep4 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		Sheep sheep5 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		//....
		
		System.out.println(sheep);
		System.out.println(sheep2);
		System.out.println(sheep3);
		System.out.println(sheep4);
		System.out.println(sheep5);
		//...
	}
}

public class Sheep implements Cloneable {
	private String name;
	private int age;
	private String color;
	private String address = "蒙古羊";
	public Sheep friend; //
	public Sheep(String name, int age, String color) {
		super();
		this.name = name;
		this.age = age;
		this.color = color;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	
	
	
	@Override
	public String toString() {
		return "Sheep [name=" + name + ", age=" + age + ", color=" + color + ", address=" + address + "]";
	}
	//克隆该实例，使用默认的构造方法来完成
	@Override
	protected Object clone()  {
		
		Sheep sheep = null;
		try {
			sheep = (Sheep)super.clone();
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println(e.getMessage());
		}
		// TODO Auto-generated method stub
		return sheep;
	}
}

public class Client {
 
	public static void main(String[] args) {
		System.out.println("原型模式完成对象的创建");
		// TODO Auto-generated method stub
		Sheep sheep = new Sheep("tom", 1, "白色	");
		
		sheep.friend = new Sheep("jack", 2, "蓝色");
		
		Sheep sheep2 = (Sheep)sheep.clone(); //克隆
		Sheep sheep3 = (Sheep)sheep.clone(); //克隆
		Sheep sheep4 = (Sheep)sheep.clone(); //克隆
		Sheep sheep5 = (Sheep)sheep.clone(); //克隆
		
		System.out.println("sheep2 =" + sheep2 + "sheep2.friend=" + sheep2.friend.hashCode());
		System.out.println("sheep3 =" + sheep3 + "sheep3.friend=" + sheep3.friend.hashCode());
		System.out.println("sheep4 =" + sheep4 + "sheep4.friend=" + sheep4.friend.hashCode());
		System.out.println("sheep5 =" + sheep5 + "sheep5.friend=" + sheep5.friend.hashCode());
	}
}

public class DeepProtoType implements Serializable, Cloneable{
	
	public String name; //String属性
	public DeepCloneableTarget deepCloneableTarget;//引用类型
	public DeepProtoType() {
		super();
	}
	
	
	//深拷贝实现方式1:重写clone方法来实现深拷贝
	@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;
	}
	
	//深拷贝实现方式2:通过对象序列化实现深拷贝
	
	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
			
			//反序列化
			bis = new ByteArrayInputStream(bos.toByteArray());
			ois = new ObjectInputStream(bis);
			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());
			}
		}
		
	}
	
}

public 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 Client {
 
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		DeepProtoType p = new DeepProtoType();
		p.name = "宋江";
		p.deepCloneableTarget = new DeepCloneableTarget("大牛", "小牛的类");
		
		//方式1完成深拷贝
		
//		DeepProtoType p2 = (DeepProtoType) p.clone();
//		
//		System.out.println("p.name=" + p.name + "p.deepCloneableTarget=" + p.deepCloneableTarget.hashCode());
//		System.out.println("p2.name=" + p.name + "p2.deepCloneableTarget=" + p2.deepCloneableTarget.hashCode());
	
		//方式2完成深拷贝
		DeepProtoType p2 = (DeepProtoType) p.deepClone();
		
		System.out.println("p.name=" + p.name + "p.deepCloneableTarget=" + p.deepCloneableTarget.hashCode());
		System.out.println("p2.name=" + p.name + "p2.deepCloneableTarget=" + p2.deepCloneableTarget.hashCode());
	
	}
}