1    /* 
2     * 
3     */
4    
5    
6    package arrayplay;
7    
8    public class Primes {
9    
10       public static void main(String[] args) {
11   
12           int[] primes = new int[4];
13   
14           primes[0] = 2;
15           primes[1] = 3;
16           primes[2] = 5;
17           primes[3] = 7;
18   
19           System.out.println("length of primes array = " + primes.length);
20           System.out.println("first prime = " + primes[0]);
21           System.out.println("last prime = " + primes[3]);
22           System.out.println("last prime = " + primes[primes.length - 1]);
23   
24   
25           System.out.println("\nThe initial array . . .");
26           int i = 0;
27           while (i < primes.length) {
28               System.out.println(primes[i]);
29               i = i + 1;
30           }
31   
32           int temp = primes[0];
33           primes[0] = primes[primes.length-1];
34           primes[primes.length-1] = temp;
35   
36           System.out.println("\nThe final array . . .");
37           for ( int x = 0; x < primes.length; x = x + 1 ) {
38               System.out.println(primes[x]);
39           }
40       }
41   }