Serializable序列化

Person

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;

import java.io.Serializable;

@Data
@ToString
@AllArgsConstructor
public class Person implements Serializable {
    private String name;
    private int age;
}

Teacher

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;

import java.io.Serializable;

@Data
@ToString
@AllArgsConstructor
public class Teacher implements Serializable {
    private String name;
    private Person person;
}

写序列化到文件

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;

// TODO 还没测试成功
public class WriteObject {
    public static void main(String[] args) {
//        try (//创建一个ObjectOutputStream输出流
//             ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("C:\\Home\\teacher.txt"))) {
//            //将对象序列化到文件s
//            Person person = new Person("9龙", 23);
//            Teacher teacher = new Teacher("路飞", person);
//            oos.writeObject(teacher);
//        } catch (Exception e) {
//            e.printStackTrace();
//        }

        try (//创建一个ObjectOutputStream输出流
             ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("D:\\teacher2.txt"))) {
            //将对象序列化到文件s
            Person person = new Person("路飞", 20);
            Teacher t1 = new Teacher("雷利", person);
            Teacher t2 = new Teacher("红发香克斯", person);
            //依次将4个对象写入输入流
            oos.writeObject(t1);
            oos.writeObject(t2);
            System.out.println(t2.hashCode());
            oos.writeObject(person);
            oos.writeObject(t2);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

从文件读序列化并实例化

import java.io.FileInputStream;
import java.io.ObjectInputStream;

public class ReadObject {
    public static void main(String[] args) {
//        try (//创建一个ObjectInputStream输入流
//             ObjectInputStream ois = new ObjectInputStream(new FileInputStream("C:\\Home\\teacher.txt"))) {
//            Teacher teacher = (Teacher) ois.readObject();
//            System.out.println(teacher);
//        } catch (Exception e) {
//            e.printStackTrace();
//        }

        try (//创建一个ObjectInputStream输入流
            ObjectInputStream ois = new ObjectInputStream(new FileInputStream("D:\\teacher2.txt"))) {
            Teacher t1 = (Teacher) ois.readObject();
            Teacher t2 = (Teacher) ois.readObject();
            Person p = (Person) ois.readObject();
            Teacher t3 = (Teacher) ois.readObject();
            System.out.println(t1 == t2);
            System.out.println(t1.getPerson() == p);
            System.out.println(t2.getPerson() == p);
            System.out.println(t2 == t3);
            System.out.println(t2.hashCode());
            System.out.println(t3.hashCode());
            System.out.println(t1.getPerson() == t2.getPerson());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}