1    package arrayplay;
2    //array program to test basics
3    public class Primes {
4    
5        public static void main(String[] args)
6        {
7            int [] primes=new int[4];
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           {
22               System.out.println(primes[i]);
23               i++;
24           }
25   
26           int temp=primes[0];
27           primes[0]=primes[primes.length-1];
28           primes[primes.length-1]=temp;
29   
30           System.out.println("\nThe final array ...");
31          for(int x=0;x<primes.length;x++)
32          {
33              System.out.println(primes[x]);
34          }
35   
36       }
37   }
38