I do not understand this code, especially the " : " means between "char ch" and "charOfName". Could you explain this code to me in Java.

2) Write a method printDigits that prints the digits in a string given as parameter. Use the isDigit(char ch) method of the Character wrapper class. public static void printDigits(String str)f char[] charOfName str.toCharArray(); for (char ch charOfName) if (Character.isDigit(ch)) System.out.printin(ch ",")