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