1    package arrayplay;
2    
3    /* 
4     * Program to serve as an introduction to arrays 
5     * Features cycling through arrays using loops 
6     */
7    
8    public class Primes {
9        public static void main(String[] args) {
10       int[] primes = new int[4];
11   
12       primes[0] = 2;
13       primes[1] = 3;
14       primes[2] = 5;
15       primes[3] = 7;
16   
17       System.out.println("length of primes array = " + primes.length);
18       System.out.println("first prime = " + primes[0]);
19       System.out.println("last prime = " + primes[3]);
20       System.out.println("last prime = " + primes[primes.length-1]);
21   
22       System.out.println("\nThe initial array ...");
23       int i = 0;
24       while ( i < primes.length ) {
25           System.out.println(primes[i]);
26           i = i + 1;
27       }
28   
29       int temp = primes[0];
30       primes[0] = primes[primes.length-1];
31       primes[primes.length-1] = temp;
32   
33       System.out.println("\nThe final array ...");
34       for ( int x = 0; x < primes.length; x = x + 1 ) {
35           System.out.println(primes[x]);}
36       }
37   }
38