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