public int getSize() { return myList.getSize(); }
public boolean isEmpty() { return myList.getSize() == 0; }
public void extend(String value) { myList.addLast(value); }
public String read() { String str = myList.get(0); myList.removeFirst(); return str; }
public void write(String value) { myList.addLast(value); myList.removeFirst(); }