1    
2    /* 
3     * Using prime to learn how to operate arrays 
4     */
5    
6    package arrayplay;
7    
8    public class Primes {
9    
10       public static void main (String[]args) {
11   
12   
13           int[] primes = new int[4];
14   
15   primes [0] = 2;
16   primes [1]= 3;
17   primes [2] = 5;
18   primes [3] = 7;
19   
20   
21   System.out.println (" length of primes array =" + primes.length);
22   System.out.println (" first prime = " + primes [0]);
23   System.out.println ("last prime = " + primes [3]);
24   System.out.println(" last prime=" + primes[primes.length-1]);
25   
26   System.out.println("\nThe initial array . . .");
27   int i = 0;
28   while(i<primes.length){
29       System.out.println(primes[i]);
30       i=i+1;
31   
32   
33   }
34     int temp = primes [0];
35   primes [0] = primes [primes.length-1];
36   primes [primes.length-1]=temp;
37   
38   System.out.println (" \nThe final array . . .");
39   for (int x = 0; x < primes.length; x = x + 1){
40       System.out.println(primes[x]);
41   }
42   
43   
44   
45       }
46   }
47