CS1 Standard Demo Page

/*
 * The first four primes, set into an array.
 */

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("\nThefinal array ...");
        for (int x = 0; x < primes.length; x=x+1) {
            System.out.println(primes[x]);
        }
    }
}