1    package arrayplay;
2    
3    public class Primes {
4    
5        public static void main(String[] args) {
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           int temp = primes[0];
26           primes[0] = primes[primes.length - 1];
27           primes[primes.length - 1] = temp;
28   
29           System.out.println("\nThe final array ...");
30           for ( int x = 0; x < primes.length; x = x + 1 ) {
31               System.out.println(primes[x]);
32           }
33       }
34   }
35