// Erika Wolfe
// This class includes sample client code for manipulating lists and sets.
import java.util.*;

public class SetExample {
    public static void main(String[] args) {      
        int[] data = {18, 4, 97, 3, 4, 18, 72, 4, 42, 42, -3};
        List<Integer> numbers1 = new ArrayList<Integer>();
        Set<Integer> numbers2 = new TreeSet<Integer>();
                
        for (int n : data) {
            numbers1.add(n);
            numbers2.add(n);
        }
        System.out.println("list numbers1 = " + numbers1);
        System.out.println("set  numbers2 = " + numbers2);
                
        numbers2.remove(42);
        System.out.println("set  numbers2 = " + numbers2);
                
        // remove all multiples of 3 from the set
        // must use an Iterator - cannot modify in a foreach loop
        Iterator<Integer> itr = numbers2.iterator();
        while (itr.hasNext()) {
            int n = itr.next();
            if (n % 3 == 0) {
                // NOT numbers2.remove(n);
                itr.remove();
            }
        }
        System.out.println("set  numbers2 = " + numbers2);
    }
}