BRAINLETS IF CORRECT!!! can someone help me make comments for this code please? not the first line tho

public int longestPrefix( String a, String b ) {
int count = 0;
int shortStringLength = 0;
if (a. length() > b. length()) shortStringLength = b. length();
else shortStringLength = a. length();
for (int i = 0; i < shortStringLength; i++) {
if (a. charAt(i) == b. charAt(i)) count ++;
else break;
}

return count;
}

Jason typically uses the internet to buy various items. it the total cost of all of the items ordered, at one time, is $250 or more, then the shipping and handling is free, otherwise the shipping and handling is $15 per item. design an algorithm that prompts jason to enter the number of items ordered and the price of each item. (remember cost = number of items order times price) the algorithm then outputs the total billing amount including shipping and handling. your algorithm must use a loop (repetition structure) to get the number and price of each item. write this in algorithm format not program code format.