In the previous unit we described how data such as that from a file could be communicated to a Java program. However, there is also a need to handle data that is communicated in more diverse fashions and, in particular, directly from a human. Such data is often taken into a system via a graphical user interface (GUI). GUI design is a major...

It is often the case that you would like a program to be able to do more than one thing at a time. You might, for example, want to monitor the keyboard for a key being pressed by a user and, at the same time, track the movement of the mouse by the user and repaint the screen. Each of these tasks can be thought of as a single thread in a...