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Traversing Characters in String

• s.charAt(i) is the ith character of the string s

• for (int i = 0; i < s.length(); i++)
  
  {
  
     char ch = s.charAt(i);
  
     process ch
  
  }
  
  

• Example: Count vowels
  

  int vowelCount = 0;
  
  String vowels = "aeiouy";
  
  for (int i = 0; i < s.length(); i++)
  
  {
  
     char ch = s.charAt(i);
  
     if (vowels.indexOf(ch) >= 0)
  
        vowelCount++;
  
  }
  
  

• s.indexOf(ch) is the index of the first occurrence of ch in s, or -1 if ch doesn't occur in s

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