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YES!! I finally got it working. It may be complicated, but it's not for something important, just a homework assignment.

while(years > 0){
jTextField1.setEditable(false);
...

That's what I don't understand. Isn't that I did here for gathering data for 12 months per year??

while(monthcount < 14){
monthrain =...

That doesn't really help... It basically you calling me stupid... I tried to simplify it, but I don't know how.

import java.text.*;
public class Rainfall extends javax.swing.JFrame {
DecimalFormat df = new DecimalFormat("#.##");
double monthrain = 0, sum = 0, average;
int years,...