public class Person implements Serializable {

public class Person implements Serializable是一个Java类的定义，它实现了Serializable接口，这意味着这个类的对象可以被序列化和反序列化。在这个类中，有三个属性：name、age和action。其中，name和age是普通属性，可以被序列化和反序列化，而action是transient属性，不能被序列化和反序列化。此外，这个类还有一个静态属性sex，也不能被序列化和反序列化。这个类还提供了一些方法，如getName()、setName()、getAge()、setAge()、getAction()和setAction()，用于获取和设置属性的值。这个类的实例可以被用于Intent传递可序列化对象。

相关问题

implements Serializable

The "implements Serializable" statement is used to indicate that a class in Java can be serialized, which means it can be converted into a stream of bytes that can be saved to a file or sent over a network. This allows the object to be reconstructed later, possibly on a different machine or at a different time, while preserving its state.

To implement serialization, a class needs to implement the Serializable interface, which is a marker interface with no methods. This means that the class only needs to declare that it implements Serializable, and the serialization mechanism will automatically handle the rest.

Here is an example of a class that implements Serializable:

public class Person implements Serializable {
  private String name;
  private int age;
  
  public Person(String name, int age) {
    this.name = name;
    this.age = age;
  }
  
  public String getName() {
    return name;
  }
  
  public int getAge() {
    return age;
  }
}

In this example, the Person class has two fields (name and age) and a constructor and two getter methods. By implementing Serializable, this class can now be serialized and deserialized using Java's built-in serialization mechanism.

现有类Person和Book，其定义如下： import java.io.Serializable; import java.time.LocalDate; public class Person implements Serializable{ private static final long serialVersionUID = 1L; private String name ; private String gender ; private LocalDate birthday ; private String biography ; public Person() { } public Person(String name , String gender , String biography , int year , int month ,int day) { this.name = name ; this.gender = gender ; this.biography = biography ; this.birthday = LocalDate.of(year , month , day) ; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public LocalDate getBirthday() { return birthday; } public void setBirthday(LocalDate birthday) { this.birthday = birthday; } public String getBiography() { return biography; } public void setBiography(String biography) { this.biography = biography; } @Override public String toString() { return "name: " + name + " , gender: " + gender + " , birthday: " + birthday + " , biography: " + biography ; } } import java.io.Serializable; public class Book implements Serializable{ private static final long serialVersionUID = 1L; private String name; private Person author; private int price; public String getName() { return name; } public void setName(String name) { this.name = name; } public Person getAuthor() { return author; } public void setAuthor(Person author) { this.author = author; } public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } public Book() { } public Book(String name,Person author,int price) { this.name = name; this.author = author; this.price = price; } @Override public String toString() { return "name: " + name + "\nauthor: " + author + "\nprice: " + price ; } } 有一段程序用objectOutputStream的writeobject()方法连续向文件dict.dic中写入了5个Book类型的对象。现请你写一段程序将这5个对象读出来。 注意：你的程序中要把Person和Book类的定义复制过去。

可以使用ObjectInputStream的readObject()方法从文件中读取序列化后的对象。具体代码如下：

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.List;

public class ReadBooks {
    public static void main(String[] args) {
        String filename = "dict.dic";
        List<Book> books = new ArrayList<>();
        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(filename))) {
            for (int i = 0; i < 5; i++) {
                Book book = (Book) ois.readObject();
                books.add(book);
            }
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
        for (Book book : books) {
            System.out.println(book);
        }
    }
}

在上面的代码中，首先定义了一个文件名filename和一个空的List<Book> books，然后使用ObjectInputStream从文件中读取5个Book对象并添加到List中。最后遍历List并打印每个Book对象的信息。