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