1    //This program is an example of an array demonstrated in the lab
2    
3             package arrayplay;
4    
5               public class Primes {
6    
7                    public static void main(String[] args) {
8    
9                       int[] primes = new int[4];
10   
11                     primes[0] = 2;
12                     primes[1] = 3;
13                     primes[2] = 5;
14                     primes[3] = 7;
15                     System.out.println("length of primes array = " + primes.length);
16                     System.out.println("first prime = " + primes[0]);
17                     System.out.println("last prime = " + primes[3]);
18                     System.out.println("last prime = " + primes[primes.length - 1]);
19   
20                     System.out.println("\nThe initial array ...");
21                    int i = 0;
22                    while (i < primes.length) {
23                             System.out.println(primes[i]);
24                             i = i + 1;
25                         }
26   
27                     int temp = primes[0];
28                     primes[0] = primes[primes.length - 1];
29                  primes[primes.length - 1] = temp;
30   
31                    System.out.println("\nThe final array ...");
32                    for (int x = 0; x < primes.length; x = x + 1) {
33                             System.out.println(primes[x]);
34                          }
35   
36                 }
37     }