java.io.Serializable 序列化问题

Person.java

package a.b.c;

public class Person implements java.io.Serializable{

//    private static final long serialVersionUID = 2481632967198330813L;

    String field1;
    String field2;
    String field3;
    public String getField1() {
        return field1;
    }
    public void setField1(String field1) {
        this.field1 = field1;
    }
    public String getField2() {
        return field2;
    }
    public void setField2(String field2) {
        this.field2 = field2;
    }
    public String getField3() {
        return field3;
    }
    public void setField3(String field3) {
        this.field3 = field3;
    }

}

Student.java   Student继承自Person,但为了清晰表示,按Person一模一样又覆盖了一遍

package a.b.c;

public class Student  extends Person implements java.io.Serializable {

//    private static final long serialVersionUID = 2481632967198330813L;

    String field1;
    String field2;
    String field3;
    public String getField1() {
        return field1;
    }
    public void setField1(String field1) {
        this.field1 = field1;
    }
    public String getField2() {
        return field2;
    }
    public void setField2(String field2) {
        this.field2 = field2;
    }
    public String getField3() {
        return field3;
    }
    public void setField3(String field3) {
        this.field3 = field3;
    }

}

SerializableWriter.java

package a.b.c;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class SerializableWriter {

    public static void main(String[] args) throws Exception{
        write();
    }

    public static void write() throws Exception{
            Student stu= new Student();
            stu.setField1("aaa111");
            stu.setField2("bbb222");
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("C:/Users/King/Desktop/jx.txt"));
            objectOutputStream.writeObject(stu);
            objectOutputStream.flush();
            objectOutputStream.close();
    }

}

SerializableReader.java

package a.b.c;

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

public class SerializableReader {

    public static void main(String[] args) throws Exception{
        read();
    }

    public static void read() throws Exception{
            ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("C:/Users/King/Desktop/jx.txt"));
            Object obj=objectInputStream.readObject();
            Person person=(Person)obj;
            System.out.println(person.getField1());
            System.out.println(person.getField2());
            objectInputStream.close();
    }

}

打印结果

aaa111
bbb222

总结

• 只要版本号一致,且Student就算删掉field3的属性和方法,仍旧可以把序列化后的Student反序列化成Student.
• 只要版本号一致,且Student  继承自父类 Person,那么就可以把序列化后的Student反序列化成Person.