1    /* 
2    A code created to print out the first four prime numbers and 
3    store them in an array named "Primes." 
4     */
5    
6    package arrayplay;
7    
8    public class Primes {
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           int temp = primes[0] ;
29           primes[0] = primes[primes.length - 1] ;
30           primes[primes.length - 1] = temp ;
31   
32           System.out.println("\nThe final array") ;
33           for ( int x = 0; x < primes.length; x = x +1 ) {
34               System.out.println(primes[x]);
35           }
36       }
37   }
38