1    /* 
2     A program to compare and contrast array processing 
3     */
4    
5    package arraylistplay;
6    
7    import javax.swing.*;
8    import java.util.ArrayList;
9    
10   public class Primes {
11       public static void main(String[] args) {
12   
13   
14           ArrayList<Integer> primes = new ArrayList<>();
15   
16           primes.add(2);
17           primes.add(3);
18           primes.add(5);
19           primes.add(7);
20   
21           System.out.println("size of primes list = " + primes.size());
22           System.out.println("first prime  = " + primes.get(0));
23           System.out.println("last prime  = " + primes.get(3));
24           System.out.println("last prime  = " + primes.get(primes.size() - 1));
25   
26           System.out.println("\nThe initial list...");
27           for (Integer prime : primes) {
28               System.out.println(prime);
29           }
30   
31           int temp = primes.get(0);
32           primes.set(0, primes.get(primes.size() - 1));
33           primes.set(primes.size() - 1, temp);
34   
35           System.out.println("\nThe final list...");
36           for (Integer prime : primes) {
37               System.out.println(prime);
38           }
39   
40       }
41   }