Check if a number is a double or an int

Question

I am trying to beautify a program by displaying 1.2 if it is 1.2 and 1 if it is 1 problem is I have stored the numbers into the arraylist as doubles. How can I check if a Number

Answer 1

Alternatively one can use this method too, I found it helpful.

double a = 1.99; 
System.out.println(Math.floor(a) == Math.ceil(a));