CS1 Standard Demo Page

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 the 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]);
        }
}
}