FizzBuzz-TDD/FizzBuzz.java

public class FizzBuzz
{
    public String isFizzBuzz(int x) {
        return isFizz(x) + isBuzz(x);
    }
    public String isFizz(int x) {
        return x % 3 == 0 ? "Fizz" : ""; 
    }
    public String isBuzz(int x) {
        return x % 5 == 0 ? "Buzz" : "";
    }
}