1    package arrayplay;
2    
3    import javax.sound.midi.SysexMessage;
4    
5    public class Primes {
6            public static void main(String[] args){
7                int[] primes = new int[4];
8    
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 = x + 1 ) {
32                   System.out.println(primes[x]);
33               }
34           }
35   }
36