我制作了自己的datastrcuture ArrayLinearList，我无法对其进行序列化

Question

我创建的课程ArrayLinearList<T>与ArrayList类似，但我无法在其中实现Serializable，所以我创建了其他class MyArray<T> extends ArrayLinearList<T> implements Serializable，但是当我尝试保存时并且读取，我的程序读取没有元素的数组

import java.io.Serializable;
import unal.datastructures.*;

public class MyArray <T>  extends ArrayLinearList<T> implements Serializable {
    private static final long serialVersionUID = -4835247906545846769L; 
}

我尝试使用此方法保存并加载

public static void writeObject(Object o, String file){
    try{
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
        oos.writeObject(o);
        oos.close();
    }catch(IOException e){
        e.printStackTrace();
    }
}

public static Object readObject(String file){
    Object ans = null;
    try{
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
        ans = ois.readObject();
        ois.close();
    }catch(IOException  | ClassNotFoundException e){
        e.printStackTrace();
    }
    return ans;
}

public static void main(String[] args) {
    MyArray<Integer> a = new MyArray<Integer>();
    for(int i=0 ; i<100 ; i++)
        a.add(i, i);
    System.out.println(a);
    writeObject(a,"Hola.dat");
    System.out.println("Readed array"+readObject("Hola.dat"));
}

它是输出

[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22， 23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47， 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72， 73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97， 98,99]

Readed array []