In this chapter we begin to write complete Java programs, making use of the Java compiler command (javac) and the Java program launch command (java). We’ll learn where Java programs begin execution, and how we can abstract away complexity by encapsulating and naming program statements making it possible to invoke them by name. We’ll explore how to create new Java objects of various types by invoking their constructors. These new objects include those that come with the Java JDK as well as graphics objects that are included in our graphics library DoodlePad. Finally, we’ll demonstrate how we can invoke new methods by interacting with our graphic objects using the mouse.
