In-place removal of vowels from a string

RemoveVowels.java

public  String removeVowels( String testString ){
  char[] s = testString.toCharArray();
  int vowelCount = 0;
  int vowelStartIndex = -1;
  
  for ( int i = 0; i < s.length; i ++ ){
    if( isVowel( s[i] ) ){
      if( vowelCount == 0 )
        vowelStartIndex = i;
      vowelCount++;
    } else{
      if( vowelCount != 0 ){
        char temp = s[vowelStartIndex];
        s[vowelStartIndex] = s[i];
        s[i] = temp;
        vowelStartIndex++;
      }
    }
  }
  char[] result = new char[s.length - vowelCount];
  for( int i = 0; i < result.length; i ++ ){
	  result[i] = s[i];
  }
  return new String( result );
}

public boolean isVowel( char a ){
  if( a == 'A' || a == 'a' || 
      a == 'E' || a == 'e' || 
      a == 'I' || a == 'i' || 
      a == 'O' || a == 'o' || 
      a == 'U' || a == 'u' ){
    return true;    
  }
  return false;
}