序列化和克隆

序列化和克隆

深度克隆的两种方式
（1）通过clone，并且克隆内部元素
- 克隆对象需要实现Cloneable接口
- 内部对象也要实现这个接口
- 克隆的时候要克隆内部对象

public class Person implements Cloneable {    public Holder holder = new Holder();    @Override    protected Object clone() throws CloneNotSupportedException {        Person p= (Person) super.clone();        Holder holder=(Holder) holder.clone();        p.holder= holder;        return p;    }}class Holder implements Cloneable{    public String key = null;    public Object value = null;    @Override    protected Object clone() throws CloneNotSupportedException {        return super.clone();    }}

（2）通过序列化克隆
- 实现序列化Serializable接口
- 内部对象也要实现Serializable接口
- 对所有对象序列化

public class Worker implements Serializable {    public Holder2 holder = new Holder2();    @Override    protected Object clone() throws CloneNotSupportedException {        try {            ByteArrayOutputStream bos                    = new ByteArrayOutputStream();            ObjectOutputStream outputStream                    = new ObjectOutputStream(bos);            outputStream.writeObject(this);            ByteArrayInputStream bis                    = new ByteArrayInputStream(bos.toByteArray());            ObjectInputStream ois                    = new ObjectInputStream(bis);            return ois.readObject();        } catch (IOException e) {            return null;        } catch (ClassNotFoundException e) {            return null;        }    }}class Holder2 implements Serializable {    public String key = null;    public Object value = null;}

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to be continue