COP 3530
Section U03
Fall 2017




                                    The HashSet Example
                                    ===================




import java.util.*;
/**
 *
 * @author pelina
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // form a set
        Set<String> s = new HashSet<String>();
        System.out.println("We add joe, alex, bill,"
                + "mark, mary, susan, mary.");
        s.add("joe");
        s.add("alex");
        s.add("bill");
        s.add("mark");
        s.add("mary");
        s.add("susan");
        s.add("mary"); // no effect
        // print the collection
        System.out.println("The set is:");
        for (String val: s)
            System.out.println(val);

        // delete bob and mark
        s.remove("bob"); // no effect
        s.remove("mark");
        // print the collection
        System.out.println("The set after removing bob and mark.");
        for (String val: s)
            System.out.println(val);

        // test contains
        boolean test1 = s.contains("mark");
        boolean test2 = s.contains("bill");
        System.out.println("mark is in the set is " + test1);
        System.out.println("bill is in the set is " + test2);
    }

}

/* the ouput
We add joe, alex, bill,mark, mary, susan, mary.
The set is:
joe
bill
susan
mark
alex
mary
The set after removing bob and mark.
joe
bill
susan
alex
mary
mark is in the set is false
bill is in the set is true
*/