im having problems with my java program?

this is what i have to do

Write a recursive method named extractNonVowels. This method shall

take a String s as a parameter and returns a String without any non-

vowel. For example: If the String s = ``Hello world", after calling

extractVowels, the String shall be ``eoo"

this is what i have

public class FIndVowels

{

public static void main(String [] args)

{

System.out.println(extracNontVowels("bananas"));

}

public static String extractNonVowels(String s)

{

if(s.length() <= 0)

{

return s;

}

else

{

if(s.charAt(0)=='a'||s.charAt(0)=='A')

return extractNonVowels(s.substring(1)) + s.charAt(0);

if(s.charAt(0)=='o'||s.charAt(0)=='O')

return extractNonVowels(s.substring(1)) + s.charAt(0);

if(s.charAt(0)=='e'||s.charAt(0)=='E')

return extractNonVowels(s.substring(1))+ s.charAt(0);

if(s.charAt(0)=='i'||s.charAt(0)=='I')

return extractNonVowels(s.substring(1)) + s.charAt(0);

if(s.charAt(0)=='u'||s.charAt(0)=='U')

return extractNonVowels(s.substring(1)) + s.charAt(0);

}

return extractNonVowels(s.substring(1));

}

}

im currently stucl