1    package arrayplay;
2    
3    public class Primes {
4    
5    public static void main(String[] args) {
6    
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   
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("\nThe initial array...");
21       int i = 0;
22       while ( i < primes.length ) {
23   
24           System.out.println(primes[i]);
25           i = i + 1;
26   
27       }
28   
29       int temp = primes[0];
30       primes[0] = primes[primes.length-1];
31       primes[primes.length-1] = temp;
32       System.out.println("\nThe final array...");
33       for ( int x = 0; x < primes.length; x = x + 1) {
34           System.out.println(primes[x]);
35       }
36   }
37   
38   
39   
40   
41   
42   
43   
44   
45   
46   }
47