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