list of int Log as String in java [duplicate]

I have a recipe, a list of Strings and int, which they are been recognized from an image.

 String elementText = "";
for (Text.Element element : line.getElements()) {
                        elementText = element.getText();
                        Point[] elementCornerPoints = element.getCornerPoints();
                        Rect elementFrame = element.getBoundingBox();
                        checkObject(elementText);

But, when i do Log.d, i get only strings:

private void checkObject(Object obj) {
        if(obj instanceof Integer){
            Log.d("log int", String.valueOf(obj));
            Log.d("log int", "it's a number");
        }
        else if(obj instanceof String){
            Log.d("log string", (String)obj);
            Log.d("log string", "it's a string");

    }
}

10:21:40.532 D oil
10:21:40.532 D it's a string

10:21:40.534 D garlic
10:21:40.534 D it's a string

10:21:40.537 D oregan
10:21:40.537 D it's a string

10:21:40.545 D 50
10:21:40.545 D it's a string

10:21:40.545 D g
10:21:40.545 D it's a string

10:21:40.545 D 120
10:21:40.545 D it's a string

I was looking to separate them in 1 arraylist with 2 parameters, (string, int). Do you think i need to create an arraylist instead of declaring elementText as string?

Update I also tried this, first part of code works great check() with output: 22:25:56.675 D List [1, 2, 120, 50] function IsInt_ByRegex is still giving int as string:

private void check(String elementText){
    try{
        int num = Integer.parseInt(this.elementText);
        // is an integer!
        Log.d("LOG int", "int " + num);
        list.add(num);
        Log.d("LOG int", "List " + list); //List [1, 2, 120, 50]
    } catch (NumberFormatException e) {
        // not an integer!
    }
}
private void IsInt_ByRegex(String elementText) {

    try{
        elementText.matches("/\\{[a-zA-Z]+\\}/");
        Log.d("LOG string", "string " + elementText);
    }catch (Exception e){

    }
}

Output: 22:25:56.674 D string 50
22:25:56.649 D string red
22:25:56.649 D string peppers
22:25:56.654 D string 120