Need some help with recursive methods in java please. Stuck on the following 3 methods

public class FunFun Fun public static void main String args) Fun Fun una app new Fun Fun Fun System. out rintln (app. fastCount Down (3 app gcd (1440, 408, 0); System. out. println "T (4) app.eTime (4 public string fastcountDown ter here code here public int god parameter (s here f code here public int e Time parameter here code here fastCountDown0 Write a recursive method that counts down by twos. Should return a string of all numbers counted with a space after each one. Here's the output for system. out.println(fastcountDown (7)) 7 5 3 1 Here's the output for system. out.println(fastcountDown(6)) 6 4 2 0