Note: I am putting these here because students have asked them in the past, this is not a reflection of what will be on quizzes.
A: Yes, the majority of Java programs will rely on some sort of object. Java is classified as an "Object Oriented Programming Language" because objects are at the core of the language and are one of the things that makes the language so powerful.
A: This class focuses in on topics that are pretty fundamental to computer science, objects is one of them. That said not all languages have objects and there will be syntactical differences between languages.
A: Not one you will likely have to deal with in this class and any limitation you do come across would be in association with your computer's memory not a limitation set by the Java.
A: So we can see all the information in an object.