java static序列化

https://blog.csdn.net/yangxiangyuibm/article/details/43227457

博主讲的很好

package test;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
 
public class Main{
    
    public static void main(String[] args){
        
        Person person = new Person();
        person.setAge(25);
        person.setName("YXY");
        Person.test="JAVA"; //modify the test value
        
        File file = new File("c:/test.txt");
        try {
            OutputStream out = new FileOutputStream(file);
            ObjectOutputStream objout = new ObjectOutputStream(out);
            objout.writeObject(person);
            objout.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        //code segment 1
        Person perobj = null;
        try {
            InputStream in = new FileInputStream(file);
            ObjectInputStream objin = new ObjectInputStream(in);
            perobj = (Person)objin.readObject();
            System.out.println(perobj.test);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

正是因为static变量不会被序列化，所以输出perobj.test时，因为perobj是一个Person类型的变量，所以jvm会到方法区中(jdk1.8之后应该到堆中找到静态变量）

发现Person类型静态属性是“JAVA”，所以打印出"JAVA"

package test;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
 
public class TEST {
    public static void main(String[] args){
        File file = new File("c:/test.txt");
        
        //code segment 1
        Person perobj = null;
        try {
            InputStream in = new FileInputStream(file);
            ObjectInputStream objin = new ObjectInputStream(in);
            perobj = (Person)objin.readObject();
            System.out.println(perobj.test);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

这时输出的就是"IBM",因为没有改变静态变量的值。