GSON treats integer as double

Question

I need to read integer and double as is in String property but GSON treats every int as double (yep, i understand that it is JSON standard).

So for example I have class:

public class MyObject {
    String value;
}

In some case i've got this JSON - {"value": 1} and sometimes - {"value": 2.4} .

And i have to display this values as they are, but first value will be read as 1.0 .

I've tried to use JsonDeserializer and TypeAdapter , both have method like getAsString and both of them firstly convert value to double and then return it.

How method looks in JsonPrimitive :

@Override
public String getAsString() {
    if (isNumber()) {
        return getAsNumber().toString();
    } else if (isBoolean()) {
        return getAsBooleanWrapper().toString();
    } else {
        return (String) value;
    }
}

You can see isNumber check here.

So is it possilbe to solve this problem somehow?

Answer 1

public class youClass(){
  private int i;
}

and then :

Gson gson = new Gson();
yourClass = gson.fromJson(jsonText , yourClass);
yourClass.getI();

hope to be usefull

Answer 2

What you could do is you can get the value as String from your JSON

And create check to know the value is double or just an integer , using below a tricky way.

Try below code:

   String stringArr[] = {"1", "1.0",  "1.2", "3.5", "2.5"};
        for(int i=0;i<stringArr.length;i++){
              if(stringArr[i].equals(String.valueOf(Double.parseDouble(stringArr[i])))){
                    System.out.println("It's a double value : "+stringArr[i]);
              }else{
                    System.out.println("It's a inte value : "+stringArr[i]);
              }
        }

Output:

It's a inte value : 1

It's a double value : 1.0

It's a double value : 1.2

It's a double value : 3.5

It's a double value : 2.5