1     /* 
2    * Some basic functionalities of array list... 
3    */
4    
5     package arraylistplay;
6    
7     import java.util.ArrayList;
8    
9     public class Primes {
10       public static void main(String[] args) {
11           ArrayList<Integer> primes = new ArrayList<>();
12               primes.add(2);
13               primes.add(3);
14               primes.add(5);
15               primes.add(7);
16   
17               System.out.println("size of primes list = " + primes.size());
18               System.out.println("first prime = " + primes.get(0));
19               System.out.println("last prime = " + primes.get(3));
20               System.out.println("last prime = " + primes.get(primes.size() - 1));
21   
22               System.out.println("\nThe initial list...");
23               for (Integer prime : primes) {
24                   System.out.println(prime);
25                }
26   
27               int temp = primes.get(0);
28               primes.set(0, primes.get(primes.size() - 1));
29               primes.set(primes.size() - 1, temp);
30   
31               System.out.println("\nThe final list...");
32               for (Integer prime : primes) {
33                   System.out.println(prime);
34               }
35   
36            }
37       }
38