The best way to make a fire with two sticks is to make sure one of them is a match.
You will find several standard utility interfaces and classes in the
java.util package. You have seen the collection classes already in Chapter 21. This chapter covers the remainder of the classes except those used for localization, which are in Chapter 24. The
java.util classes covered in this chapter are
Formatter—. A class for producing formatted text.
BitSet—. A dynamically sized bit vector.
Observable—. An interface/class pair that enables an object to be
Observable by having one or more
Observer objects that are notified when something interesting happens in the
Random—. A class to ...