class Person implements Serializable {
 //实现序列化接口，其中的String，int也都是实现了Serializable的，不然就会报错
  private static final long serialVersionUID = 7072662597320618920L;
  String name;
  int age;

  public Person(String name, int age) {
    this.name = name;
    this.age = age;
  }

  @Override
  public String toString() {
    return "Person [name=" + name + ", age=" + age + "]";
  }
}

public class ObjectStreamTest {
  private ObjectInputStream ips;

  @Test
  public void outStreamTest() throws Exception {
    File file = new File("D:/person.txt");
    Person p1 = new Person("hanking", 24);
    Person p2 = new Person("Hust", 120);
    FileOutputStream fos = new FileOutputStream(file);
    ObjectOutputStream ops = new ObjectOutputStream(fos);
    ops.writeObject(p2);
    ops.writeObject(p1);
    ops.flush();
    ops.close();
  }

  @Test
  public void InStreamTest() throws Exception {
    ips = new ObjectInputStream(new FileInputStream("D:/person.txt"));
    Person p1 = (Person) ips.readObject();
    System.out.println(":" + p1);
    Person p2 = (Person) ips.readObject();
    System.out.println(":" + p2);
    ips.close();
  }
}