1 /*
 2  * introduction to array lists and how to use them
 3  */
 4 package arraylistplay;
 5 
 6 import java.util.ArrayList;
 7 
 8 
 9 /**
10  *
11  * @author sjenks
12  */
13 public class Primes {
14 
15     /**
16      * @param args the command line arguments
17      */
18     public static void main(String[] args) {
19         ArrayList<Integer> primes = new ArrayList<>();
20         
21         primes.add(2);
22         primes.add(3);
23         primes.add(5);
24         primes.add(7);
25         
26         System.out.println("size of primes list = " + primes.size());
27         System.out.println("first prime = " + primes.get(0));
28         System.out.println ("lastprime = " + primes.get(3));
29         System.out.println("lastprime = " +primes.get(primes.size()-1));
30         
31         System.out.println("\nthe initial list ...");
32         for ( Integer prime : primes){
33             System.out.println(prime);
34         }
35         
36         int temp = primes.get(0);
37         primes.set(0, primes.get(primes.size()-1));
38         primes.set(primes.size()-1, temp);
39         
40         System.out.println("\nThe final Llist ...");
41         for ( Integer prime : primes){
42             System.out.println(prime);
43         }
44         
45        
46     }
47     
48 }
49