1 /*
 2  * Program to manage an array of prime numbers.
 3  */
 4 
 5 package arrayplay;
 6 
 7 /**
 8  *
 9  * @author kchan2
10  */
11 
12 public class Primes {
13 
14     /**
15      * @param args the command line arguments
16      */
17     public static void main(String[] args) {
18         int[] primes = new int[4];
19         primes[0] = 2;
20         primes[1] = 3;
21         primes[2] = 5;
22         primes[3] = 7;
23         
24         System.out.println("length of primes array = " + primes.length);
25         System.out.println("first prime = " + primes[0]);
26         System.out.println("last prime = " + primes[3]);
27         System.out.println("last prime = " + primes[primes.length-1]);
28         
29         System.out.println("\nThe initial array ...");
30         int i = 0;
31         while ( i < primes.length) {
32             System.out.println(primes[i]);
33             i = i +1;
34         }
35         
36         int temp = primes[0];
37         primes[0] = primes[primes.length-1];
38         primes[primes.length-1] = temp;
39         
40         System.out.println("\nThe final array ...");
41         for (int x = 0; x < primes.length; x = x + 1) {
42             System.out.println(primes[x]);
43         }
44     }
45     
46 }
47