java iterate over a string
String scientistName = "Isaac Newton";
for (int i = 0; i < scientistName.length(); i++) {
System.out.print(scientistName.charAt(i) + " "); // I s a a c N e w t o n
}
//*********************************************************
// you can cast a string into a char[]
String str = "strings are not primitive types!";
for (char ch : str.toCharArray()) {
System.out.print(scientistName.charAt(i) + " ");
}
}