java (31) - 序列化实现深克隆

一.序列化：

   把对象写到流里面的过程是序列化，而把对象从流中读出来的过程叫做反序列化。在java中实现深克隆对象，常常可以先使对象实现Serializable接口，然后把对象写到一个流里面，然后再从流中读取出来，便可以重建对象。

二.序列化实现：

<strong><span style="font-size:14px;">public class Main
{
	public static void main(String[] args) throws Exception
	{
		Teacher3 t = new Teacher3();
		
		t.setAge(40);
		t.setName("Teacher Zhang");
		
		Student3 s1 = new Student3();
		
		s1.setAge(20);
		s1.setName("zhangsan");
		s1.setTeacher(t);
		
		Student3 s2 = (Student3)s1.deepCopy();
		
		System.out.println(s2.getAge());
		System.out.println(s2.getName());
		
		System.out.println("-----------------------");
		
		System.out.println(s2.getTeacher().getAge());
		System.out.println(s2.getTeacher().getName());
		
		s2.getTeacher().setAge(50);
		s2.getTeacher().setName("Teacher Li");
		
		System.out.println(s1.getTeacher().getAge());
		System.out.println(s1.getTeacher().getName());
		
		
		
		
	}
	
	
}



class Teacher3 implements Serializable
{
	private int age;
	
	private String name;

	public int getAge()
	{
		return age;
	}

	public void setAge(int age)
	{
		this.age = age;
	}

	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}
}

class Student3 implements Serializable
{
	private int age;
	
	private String name;
	
	private Teacher3 teacher;

	public int getAge()
	{
		return age;
	}

	public void setAge(int age)
	{
		this.age = age;
	}

	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}

	public Teacher3 getTeacher()
	{
		return teacher;
	}

	public void setTeacher(Teacher3 teacher)
	{
		this.teacher = teacher;
	}
	
	public Object deepCopy() throws Exception
	{
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		
		ObjectOutputStream oos = new ObjectOutputStream(bos);
		
		oos.writeObject(this);
		
		ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
		
		ObjectInputStream ois = new ObjectInputStream(bis);
		
		return ois.readObject();
	}
}</span></strong>

打印：

20
zhangsan
-----------------------
40
Teacher Zhang
40
Teacher Zhang
三.serialVersionUID含义：

serialVersionUID是为了让该类别Serializable向后兼容。例如当你的对象序列化后存到硬盘上面后，可是后来更改了类的field（增加或减少），当你反序列化时，就会出现Exception的，这样就会造成不兼容性的问题。但当serialVersionUID相同时，它就会将不一样的field以type的缺省值Deserialize，这个可以避开不兼容性的问题。

java (31) - 序列化实现深克隆

原文：http://blog.csdn.net/u010708662/article/details/45129765