java - Type check in a Json String -

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i wrote method verify types of json string:

public static boolean loginmessagecheck(string json){     boolean ret = false;     jsonobject o = new jsonobject(json);      object ty = o.get("type");     object ex = o.get("expansions");     if(ty instanceof string){         if(ex instanceof string[]){             ret = true;          }     }     return ret;  }

so testing method this.

public static void main(string[] args){     string[] expansions= {"chat", "test"};     loginmessage_client lm = new loginmessage_client("login", expansions);     gson gson = new gson();     string json = gson.tojson(lm);     system.out.println(loginmessagecheck(json)); }

it returns false because of - if(ex instanceof string[]). how can check if array string array?

because 

if(ty instanceof string)

and ty being not string


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