ObjectStream

import java.io.*;


/*
将对象从对内存中保存到本地硬盘上。
实现对象的本地持久化保存。
但被保存的对象必须实现一个Serializable接口。
拥有一个UID。

transient：关键字用于不需要本地持久化保存的成员属性。
*/
class  ObjectOutputStreamDemo
{
	public static void main(String[] args) throws IOException
	{
		
		ObjectOutputStream oos = 
			new ObjectOutputStream(new FileOutputStream("obj.txt"));

		
		oos.writeObject(new Person("zhangsan",30,199));

		oos.close();
		/**/
	}
}

class Person implements Serializable
{
	public static final long serialVersionUID = 42L;

	private transient String name;
	private int age;
	private  int num ;
	Person(String name,int age,int num)
	{
		this.name = name;
		this.age = age;
		this.num = num;
	}
	public String toString()
	{
		return name+"::"+age+":"+num;
	}
}

 

import java.io.*;
class  ObjectInputStreamDemo
{
	public static void main(String[] args) throws Exception
	{
		ObjectInputStream ois = 
			new ObjectInputStream(new FileInputStream("obj.txt"));

		Person p = (Person)ois.readObject();

		System.out.println(p.toString());

		ois.close();
	}
}