1    /* Program to use array to input data and print the output 
2     */
3    
4    package arrayplay;
5    
6    public class Primes {
7        public static void main(String[] args) {
8    
9            int[] primes = new int[4];
10   
11           primes[0]=2;
12           primes[1]=3;
13           primes[2]=5;
14           primes[3]=7;
15   
16           System.out.println("length of primes array = " + primes.length);
17           System.out.println("first prime  = " + primes[0]);
18           System.out.println("last prime  = " + primes[3]);
19           System.out.println("last prime = " + primes[primes.length-1]);
20   
21           System.out.println("\nThe 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("\nThe final array...");
33           for (int x = 0; x < primes.length; x = x+1) {
34               System.out.println(primes[x]);
35           }
36       }
37   }
38