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