1    package arrayplay;
2    
3    public class Primes {
4        public static void main(String[] args) {
5            int[] primes = new int[4];
6            primes[0] = 2;
7            primes[1] = 3;
8            primes[2] = 5;
9            primes[3] = 7;
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           int temp = primes[0];
22           primes[0] = primes[primes.length-1];
23           primes[primes.length-1] = temp;
24           System.out.println("\nThe final array ...");
25           for ( int x = 0; x < primes.length; x = x + 1 ) {
26               System.out.println(primes[x]);
27           }
28       }
29   }
30