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