1    
2    
3    package arrayplay;
4    
5    public class Primes {
6        public static void main(String[] args) {
7            int[] primes = new int [4];
8    
9            primes [0] = 2;
10           primes [1] = 3;
11           primes [2] = 5;
12           primes [3] = 7;
13   
14           System.out.println("length of primes array = " + primes.length);
15           System.out.println("First Prime = " + primes[0]);
16           System.out.println("Last Prime = " + primes[3]);
17           System.out.println("Last Prime = " + primes[primes.length-1]);
18   
19           System.out.println("\nThe intial array ...");
20           int i = 0;
21           while (i < primes.length)
22           {
23               System.out.println(primes[i]);
24               i+=1;
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+=1)
32           {
33               System.out.println(primes[x]);
34           }
35   
36       }
37   }
38   
39