import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;

/**
*
* @author
*/
public class Part1 {

public static void main(String[] args) {
   ArrayList<Long> prime = new ArrayList<>();
   generate(prime);
   write(prime, "prime.txt");

   ArrayList<Long> prime_list = new ArrayList<>();
   readFile(prime_list, "prime.txt");

   Scanner scan = new Scanner(System.in);

   int selection;
   do {
         System.out.println("please enter a 10-digit phone number");
         Long phoneNumber = scan.nextLong();
         String result = "";

         boolean isPrime = true;
         for (Long num : prime_list) {
            if (phoneNumber.equals(num)) {
               break;
            }
            if (phoneNumber % num == 0L) {
               isPrime = false;
               for (int i = 0; i < prime_list.size(); i++) {
                     Long get = prime_list.get(i);
                     if (phoneNumber % get == 0L) {
                        result += get.toString() + " ";
                        phoneNumber = phoneNumber / get;
                        while (phoneNumber % get == 0L) {
                           phoneNumber = phoneNumber / get;
                        }
                     }
               }
               break;
            }
         }

Lab 13: Java Arrays The Birthday Coincidence Objectives: Java...