package arrayplay; public class Primes { public static void main(String[]args){ int[]primes = new int[4]; primes[0] = 2; primes[1] = 3; primes[2] = 5; primes[3] = 7; System.out.println("length of primes array ..." + primes.length); System.out.println("first prime =" + primes[0]); System.out.println("last prime =" + primes[3]); System.out.println("last prime = " + primes[primes.length-1]); System.out.println("\nThe initial array ..."); int i = 0; while(i < primes.length){ System.out.println( primes[i]); i = i+1; } int temp = primes[0]; primes[0] = primes[primes.length-1]; primes[primes.length-1] = temp; System.out.println("\nThe final array ..."); for(int x = 0; x < primes.length; x = x + 1){ System.out.println(primes[x]); } } }