How many times a char showed up in a string

Question

Hi
assume that i have this String:
String s = "I have son and he has son and his son that has a son also"
how can i determine how many times 's' showed up in this string?
thanks

Answer 1

there are many ways to accomplish this goal. All ways will require you to iterate through the String or char array, so the key is probably to simply avoid constructing new String instances on an unnecessary basis. Here is one way to accomplish what you are asking:
for (int x = 0; x < string.length(); x++) {
if (string.charAt(x) == 'i') {
//record this index
list.put(x);