代码如下：

public class MyWork {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        //序列化
        File f = new File("testFile/testObject.txt");
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(f));
        ArrayList<Student> list1 = new ArrayList<>();
        Student s1 = new Student("张三",18);
        Student s2 = new Student("李四",19);
        Student s3 = new Student("王武",20);
        list1.add(s1);
        list1.add(s2);
        list1.add(s3);
        oos.writeObject(list1);
        oos.close();

        //反序列化
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(f));
        ArrayList<Student> list2 = (ArrayList<Student>) ois.readObject();
        Iterator<Student> it = list2.iterator();
        while(it.hasNext()){
            Student stu = it.next();
            System.out.println(stu.getName() + "======" + stu.getAge());
        }
        ois.close();
    }
}