1    package arrayplay;
2    
3    public class primes {
4        public static void main(String[] args) {
5    
6            int[] primes = new int[4];
7    
8            primes[0] = 2;
9            primes[1]= 3;
10           primes[2] = 5;
11           primes[3]= 7;
12   
13           System.out.println("length of primes array =" +primes.length);
14           System.out.println("first prime =" +primes[0]);
15           System.out.println("last prime =" +primes[3]);
16           System.out.println("last prime =" +primes[primes.length - 1] );
17   
18           System.out.println("/nThe initial array...");
19           int i = 0;
20           while (i < primes.length) {
21               System.out.println(primes[i]);
22               i = 1+i;
23           }
24   
25           int temp = primes[0];
26           primes[0] = primes[primes.length-1];
27           primes[primes.length-1] = temp;
28   
29           System.out.println("/nThe final array...");
30           for (int x = 0; x < primes.length; x=x +1) {
31               System.out.println(primes[x]);
32           }
33   
34   
35   
36   
37   }}
38