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