Java tutorial
import java.util.ArrayList; import java.util.Collection; public class PlanetSet { public static void main(String args[]) { String names[] = { "Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto" }; Collection planets = new ArrayList(); for (int i = 0, n = names.length; i < n; i++) { planets.add(names[i]); } String s[] = (String[]) planets.toArray(new String[0]); for (int i = 0, n = s.length; i < n; i++) { System.out.println(s[i]); } planets.remove(names[3]); System.out.println(names[1] + " " + planets.contains(names[1])); System.out.println(names[3] + " " + planets.contains(names[3])); } }