Storing Scala data structures on disk

Question

I am trying to store result of some computations which I have stored in memory in HashMap and a List . Is there a way to store and load these data structures on disk so that I don't have to repeat this process over and over again?

EDIT

1. I am looking for a standard library like pickle in python and not an external dependency.

Answer 1

Both List and HashMap (as well as other collections) are Serializable in Scala, which means that standard Java serialization mechanisms can be applied to them.

You can store the objects by creating an ObjectOutputStream and calling its writeObject(obj) method.

The same applies for reading objects through an ObjectInputStream and its readObject() method.

The objects in the collections to read/write are also expected to be Serializable , so if it's not yet the case, you'll need to make them implement the interface.