Parse A Json file into a Tree in order to use every single object and array

I'm trying to get the structure of a nested Json file ( into a String ). What I would like to know is which table is in which object which object is in which other in order to manipulate each of these objects. What would be interesting is to use a tree as in Jackson, but the problem is that I did not understand how to parse and have one by one in an arraylist of arraylist for example the objects nested in a json file lambda.