如何在Java中存储worker对象列表？

Question

What is the most convenient way to store list of workers in Java considering following conditions:

1. Each worker has attributes of Name, LastName, Wage, BirthDate. 2.I want to store them in file by appending when needed. For example 1 object I added to file today, 1 tomorrow, 3 in one month and so on.
2. I want to read them also when needed, retrieve, sort, delete, edit and perform other operations.
3. I tried to store them in file with ObjectOutputStream, but the problem is I need to store them at once, so appending later is not possible.

So my question is which type of storing to implement?

Answer 1

I suppose workers is a struct... Have you thought on using an array of workers? or a list?

Answer 2

So here's the thing I think you're missing: ObjectOutputStream is a method for carrying out serialization (the converting of an object to a writable value). So, to use OOS, you have to implement that in your worker class to allow it to be serialized on its own. But, since you want to store more than one of these, you can use one of the many java storage mechanisms (all of which implement serializable).

For this particular situation, I'd recommend using an ArrayList. Put all of the worker objects in an ArrayList and then send that list to the ObjectOutputStream. Then, when you pull the list back into your code from the file, you can continue to add more workers to it as you please and then you can serialize the updated list without a problem.

Once you have the list pulled into your code, you can use myList.get(index) , myList.remove(index) and all of the other methods that you can find here: https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html

As an aside, I think an ArrayList would be better than a normal array because when you declare and instantiate a normal array you have to specify the length of the array. When you use the ArrayList, you can have as many objects as you want in the list.