1    /* 
2     * A program to study the basic features and usage of array. 
3     */
4    package arrayPlay;
5    
6    public class Primes {
7        public static void main (String[] args){
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 initial array...");
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 array...");
31           for (int x= 0; x<primes.length; x++){
32               System.out.println(primes[x]);
33           }
34       }
35   }
36