1    package arrayplay;
2    
3    public class Primes {
4        public static void main(String[] args){
5            int [] primes= new int[4];
6            primes[0]=2;
7            primes[1]=3;
8            primes[2]=5;
9            primes[3]=7;
10   
11           System.out.println("length of primes array="+ primes.length);
12           System.out.println("first prime="+ primes[0]);
13           System.out.println("last prime="+ primes[3]);
14           System.out.println("last prime="+primes[primes.length-1]);
15   
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   
26           System.out.println("\nThe final array...");
27           for (int x=0; x<primes.length; x= x+1) {
28               System.out.println(primes[x]);
29           }
30   
31       }
32   }
33