1    /* 
2     * A program designed to print out the prime numbers 2,3,5, and 7 using an array. 
3     */
4    
5    package arrayplay;
6    
7    public class Primes {
8    
9        public static void main(String[] args) {
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           int temp = primes[0];
30           primes[0]= primes[primes.length -1];
31           primes[primes.length -1] = temp;
32   
33           System.out.println("\nThe final array ...");
34           for ( int x = 0; x < primes.length; x= x +1) {
35               System.out.println(primes[x]);
36           }
37   
38       }
39   }
40