1 package Arrayplay; 2 // program using arrays and prime numbers as well as for loops and while loops 3 public class Primes { 4 public static void main(String[] args) { 5 int[] primes = new int[4]; 6 7 primes[0] = 2; 8 primes[1] = 3; 9 primes[2] = 5; 10 primes[3] = 7; 11 12 System.out.println("length of primes array = " + primes.length); 13 System.out.println("First prime = " + primes[0]); 14 System.out.println("Last prime = " + primes[3]); 15 System.out.println("last prime = " + primes[primes.length-1]); 16 17 System.out.println("\nThe Initial array ..."); 18 int i = 0; 19 while ( i < primes.length) { 20 System.out.println(primes[i]); 21 i = i + 1; 22 } 23 int temp = primes[0]; 24 primes[0] = primes[primes.length-1]; 25 primes[primes.length-1] = temp; 26 27 System.out.println("\nThe final Array ..."); 28 for (int x = 0; x < primes.length; x = x + 1 ) { 29 System.out.println(primes[x]); 30 } 31 32 } 33 } 34 35