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