1    package arrayplay;
2    
3    import java.util.ArrayList;
4    
5    public class Primes {
6        public static void main(String[] args) {
7    
8            int[] primes = new int[4];
9                    primes[0] = 2;
10                   primes[1] = 3;
11                   primes[2] = 5;
12                   primes[3] = 7;
13   
14                   System.out.println("length of primes array =" + primes.length);
15                   System.out.println("first prime = " + primes[0]);
16                   System.out.println("last prime = " + primes[3]);
17                   System.out.println("last prime = " + primes[primes.length-1]);
18   
19                   System.out.println("\nThe intial list ... ");
20                   int i = 0;
21                   while ( i < primes.length ) {
22                       System.out.println(primes[i]);
23                       i = i + 1;
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 list ...");
31            for ( int x = 0; x < primes.length; x = x + 1){
32                System.out.println(primes[x]);
33            }
34       }
35   }
36