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

博主講的很好

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();
        }
    }
}

正是因為static變數不會被序列化，所以輸出perobj.test時，因為perobj是一個Person型別的變數，所以jvm會到方法區中(jdk1.8之後應該到堆中找到靜態變數）

發現Person型別靜態屬性是“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();
        }
    }
}

這時輸出的就是"IBM",因為沒有改變靜態變數的值。