Java/Android - Doesn't add the two values of RatingBar? -

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suppose set first value of ratingbar 1 , second value 1,it doesn't add 2.instead shows 1.01.0 .what's wrong here? 

    ratingbar r1,r2;     button submit;     r1 = (ratingbar) findviewbyid(r.id.ratingbar1);     r2 = (ratingbar) findviewbyid(r.id.ratingbar2);       submit = (button) findviewbyid(r.id.submit);      submit.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             toast.maketext(myactivity.this, string.valueof(r1.getrating())+string.valueof(r2.getrating()), toast.length_short).show();  //shows 1.01.0         }     });

it because using + string objects , int. + operator string has meaning of concatenation. want achievable summing values , converting string. change from

string.valueof(r1.getrating())+string.valueof(r2.getrating())

to

string.valueof(r1.getrating() + r2.getrating())

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