java: save and retrieve objects as objects rather than text information?

I have a program that actually stores inputted data into an array. These data will the开发者_如何转开发n be displayed through a text file from the array. I was asked to modify these program so that it is saving and retrieving objects as objects rather than a text information and i don't really know how to do that.. Need some advice thanks.

You can also use the very simple XStream library as documented per their "two minute tutorial".