This is the first of three sections that cover OOP in Java. This section covers instance variables, methods, and constructors. These tutorial sections are primarily aimed at developers who are already familiar with at least one other language, but don't know Java syntax. So, if you have never seen object-oriented programming AT ALL before, this section might move too quickly for you.
See http://courses.coreservlets.com/Course-Materials/java.html for the complete tutorial series (Programming with Java 8) and associated code. That site also lets you download PDF files of each lecture for saving or printing, and includes exercises and exercise solutions for each of the topics.