Question

I have a logic problem. User is allowed to add any number of fields to the form. Upon form submission, I need to collect the values of all the fields and store them in an ArrayList. The problem is that I don’t know whether there will be only 1 field in the form, or 500.

The way I differentiate individual form fields is by adding index number to their name, so in a form there are fields with name=”field1″, name=”field2″ etc.

Here is the code that I have so far:

for (int i = 1; i < number of fields; i++) {
    while (request.getParameter("field" + Integer.toString(i)) != null) {
        Add to ArrayList
    }
}

How can I find the number of fields? Or maybe there is another solution to this problem?

Answer 1

Use a while loop:

int i=0;

while (request.getParameter("field" + Integer.toString(i)) != null) {

    // Add to ArrayList

    i++; // very important, don't forget this one
}

// i is the count of fields at this point