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