import java.util.*; 

public class ActionList {
    private Vector agenda;
    public synchronized String get() {
	while (agenda.size() == 0) {
	    try {
		// wait for producer
		wait();
	    } catch (InterruptedException e) { }
	}
	String value = (String) agenda.remove(0);
	notifyAll();
	return value;
    }
    public synchronized void put(String value) {
	agenda.addElement(value);
	notifyAll();
    }
    public ActionList() {
	agenda = new Vector();
    } }