CODEWITHSUNDEEP
javajsongson
Idan
Idan

Reputation: 951

There is a way to know which type json is represent?

let's say i have two objects: Person and ReqSingUp, and ReqSingUp contains Person.

Now if i try:

Person p=new Person("dan","lala");
ReqSingUp reqSingUp=new ReqSingUp(p);
String s = gson.toJson(reqSingUp,ReqSingUp.class);
Object o = gson.fromJson(s, Object.class);

if (o instanceof ReqSingUp) {
    System.out.println("it's ReqSingUp");
}
if (o instanceof Person ) {
    System.out.println("it's person");
}

it does not satisfy any condition (not instanceof ReqSingUp and not instanceof Person ).

Is there a way to know which type it is?

Thanks in advance.

Upvotes: 0

Views: 59

Answers (1)

Jack
Jack

Reputation: 133609

No, there is no way to directly know it.

This because the information contained in a JSon file doesn't contain directly any type information about the object that is serialized in there. That's why you usually provide the class when reading a JSon file, as in

fromJSon(myObject, MyClass.class)

This indeed creates problem even when reading collection of arbitrary types or genericized objects.

Upvotes: 2

Related Questions