package com.github.thzt;

import java.io.Serializable;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class Test {
    public static void main(String[] args) throws Exception {
        A a1 = new A();

        ObjectOutputStream output = new ObjectOutputStream(
            new FileOutputStream(new File("/Users/thzt/Test/a.txt")));
        output.writeObject(a1);
        output.close();

        ObjectInputStream input = new ObjectInputStream(
            new FileInputStream(new File("/Users/thzt/Test/a.txt")));
        A a2 = (A) input.readObject();
        a2.test();
        input.close();
    }
}

class A implements Serializable {
    public void test() {
        System.out.println("Test Serializable");
    }
}

注：
（1）序列化并不是序列化成JSON，而是序列化为二进制
（2）不只是数据，对象中包含的方法也可以被序列化