java - Re-using top level models with gson -

i using gson parse json response.

if have json structure looks this:

"x" : {      "y" : [          {              "a" : "x",              "b" : "y"            },        ....      ] }, "a" : {      "y" : [          {              "c" : "1",              "d" : "2"          },         ....      ]   } 

i want able re-use "y" , have contents of y parsed different models @ runtime.

if define top level model topjson.java , define fields as

private modelx x; private modela a; 

and define modelx.java as:

private modely y; 

and modela.java :

private modely y; 

and modely.java :

private list<something> results; 

how can use generics ensure modely can contain different types of models? how can handle case when don't know structure of json looks like?