import edu.princeton.cs.algs4.StdOut;
import edu.princeton.cs.algs4.Queue;
import java.util.Iterator;

public class Example3 {
    
    public static void main(String[] args) {
        Queue<String> q = new Queue<String>();
        q.enqueue("hello");
        q.enqueue("world");
        q.enqueue("!");

        // Two ways of iterating over the objects of q.
        // ...
    }
    
}