Need help with an array project please =)

Question

I'm having trouble figuring out where to start. My project is to create an applet that accepts 20 numbers from a text field one by one and adds them to an array. The numbers have to be between 10 and 50 or else the applet shouldn't include them in the 20 but duplicates should be included in the 20. The applet then has to display all the numbers except for duplicates. example:
user inputs:
10,11,12,13,14,15,16,16,16,17,18,19,20,20,20,21,23,24,25,26
applet detects that 20 numbers have been entered and displays them exluding duplicates:
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26
If the user imputs a number like 72 I need to make it alert them that the number was not in the 10-50 range and not add that number to the total 20.
I'm not asking anyone to do this for me, I'm just asking for tips on where to get a good start.
Thanks!

Answer 1

//i haven't tryed that code, and it might not work
// anyhow, just in case, i'll also say that this is not an applet
public class NoDublicates {
public static void main(String[] args) {
  if (args.length < 20) {
   System.out.println("usage:\njava NoDublicates "
     + "<and 20 space separated numbers from 10 to 50 here>");
   System.exit(1);
  byte[] nums = new byte[args.length];
  int i = 0;
  for (int j = 0; j < args.length; j++) {
   try {
    int temp = Integer.parseInt(args[j]);
    if (temp <= 50 && temp >= 10) {
     nums[i++] = temp;
   } catch (NumberFormatException nfe) {
    // very bad exception, i think i'll ignore it
  if (i != 20) {
   System.out.println("it seems that i didn't get exactly 20 "
    + "parseable numbers as arguments, let's exit now.");
   System.exit(1);
  java.util.Arrays.sort(nums);
  int old = 0;
  for (int j = 0; j < 20; j++) {
   if (nums[j] != old) {
    System.out.print(nums[j] + " ");
   old = nums[j];
}