The Java Utility Package This Java package, java.util, contains a collection of utility classes. Among them are several generic data structures (Dictionary, Stack, Vector, Hashtable) a useful object for tokenizing a string and another for manipulating calendar dates. The java.util package also contains the Observer interface and Observable class which allow objects to notify one another when they change. The java.util classes aren’t covered separately in this tutorial although some examples use these classes.
1. Are a programmer’s way of telling the compiler to ignore possible loss of data …