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