1    /* 
2    *Getting acquainted with basic array processing functionality 
3     */
4    
5    package arrayplay;
6    
7    public class Primes {
8        public static void main(String[] args) {
9    
10           int[] primes = new int[4];
11   
12           primes[0] = 2;
13           primes[1] = 3;
14           primes[2] = 5;
15           primes[3] = 7;
16   
17           System.out.println("length of primes array =" + primes.length);
18           System.out.println("first prime = " + primes[0]);
19           System.out.println("last prime = " + primes[3]);
20           System.out.println("last prime = " + primes[primes.length-1]);
21   
22           System.out.println("/nTHe initial array ...");
23           int i = 0;
24           while (i < primes.length) {
25               System.out.println(primes[i]);
26               i = i + 1;
27   
28           }
29   
30           int temp = primes[0];
31           primes[0] = primes[primes.length-1];
32           primes[primes.length-1] = temp;
33   
34           System.out.println("/nThe final array ...");
35           for ( int x = 0; x < primes.length; x = x + 1) {
36               System.out.println(primes[x]);
37           }
38   
39       }
40   }