创建型模式：05-原型模式

浅克隆

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深克隆

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示例代码：

import java.io.*;

public class Dog implements Cloneable, Serializable {

    private static final long serialVersionUID = 1589397062304887365L;

    String color;
    Integer old;
    Dog son;
    Dog(String color, Integer old, Dog son){
        this.color =  color;
        this.old =  old;
        this.son =  son;
    }

    //浅克隆(ShallowClone)
    @Override
    public Dog clone() {
        try {
            return (Dog) super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            return null;
        }
    }

    //深克隆(DeepClone)
    public Dog deepClone() {

        //将对象写入流中
        ByteArrayOutputStream bao=new ByteArrayOutputStream();
        try(ObjectOutputStream oos= new ObjectOutputStream(bao)) {
            oos.writeObject(this);
        } catch (IOException e) {
            e.printStackTrace();
        }

        //将对象从流中取出
        try(ByteArrayInputStream bis=new ByteArrayInputStream(bao.toByteArray());
            ObjectInputStream ois= new ObjectInputStream(bis)) {
            return (Dog)ois.readObject();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

}

public class TestShallowClone {
    public static void main(String[] args) {
        Dog son = new Dog("red", new Integer(1),null);
        Dog father = new Dog("black", new Integer(5), son);

        Dog father2 = father.clone();
        System.out.println(father==father2);
        System.out.println(father.color==father2.color);
        System.out.println(father.old==father2.old);
        System.out.println(father.old.equals(father2.old));
        System.out.println(father.son==father2.son);
    }
}

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public class TestDeepClone {
    public static void main(String[] args) {
        Dog son = new Dog("red", new Integer(1),null);
        Dog father = new Dog("black", new Integer(5), son);

        Dog father2 = father.deepClone();
        System.out.println(father==father2);
        System.out.println(father.color==father2.color);
        System.out.println(father.old==father2.old);
        System.out.println(father.old.equals(father2.old));
        System.out.println(father.son==father2.son);

    }
}

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