im currently stock in my java program?

Question

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 stuck

david · Accepted Answer

It's OK, I can imagine what's on that line.  (Yahoo will cut things off if they don't contain a space.)

You don't say what the problem is.  Your program appears to mostly work, except it's printing in reverse order.

Change this:
return extractNonVowels(s.substring(1)) + s.charAt(0)
to this:
return s.charAt(0) + extractNonVowels(s.substring(1))

and it should be good.

John · Answer

public class Program {
  public static void main(String[] args) {
    String result = extractNonVowels( "Hello world");
    System.out.println(result);
  }
  
  private static String extractNonVowels( String value) {
    String pattern = "(?i)[^aeiou]";
    return value.replaceAll(pattern, "");
  }
}

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im currently stock in my java program?

2 Answers