Is JsonElement integer or float?

user_365837 0
Viewed 2824

Is it possible to determine whether a GSON JsonElement instance is an integer or is it a float?

I'm able to determine whether it's a number:

JsonElement value = ...
boolean isNumber = value.getAsJsonPrimitive().isNumber();

But how to determine if it's an integer or a float, so I can subsequently use the correct conversion method? Either

float f = value.getAsJsonPrimitive().getAsFloat();

or

int i = value.getAsJsonPrimitive().getAsInt();

Edit: The other question may answer why this may be not implemented in GSON, but this question definitely isn't its duplicate.

gson java
2 Answers

The only way I've found so far is using regex on a string:

if (value.getAsJsonPrimitive().isNumber()) {
    String num = value.getAsString();
    boolean isFloat = num.matches("[-+]?[0-9]*\\.[0-9]+");
    if (isFloat)
        System.out.println("FLOAT");
    else
        System.out.println("INTEGER");
}

This correctly determines 123 as integer, and both 123.45 and 123.0 as floats.

user_3658370

use something like, and so if return json object is an instance of float or integer you can then apply the required get:

JSONObject jObj = new JSONObject(jString);
Object aObj = jObj.get("a");
if(aObj instanceof Integer){
    System.out.println(aObj);
}
user_88429780
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