Using Objects and Methods

Before you write a single line of your own logic, you need to understand what it means to call code that already exists. This unit's claim is that programming is not about memorizing syntax: it's about understanding what objects are, what methods do, and how data moves through expressions and assignments. You practice reading method signatures, instantiating objects, and using the String and Math classes before you could possibly write them yourself. That sequence is intentional: calling an abstraction before building one is how you learn what an abstraction is for. Every later unit assumes you know how a method call works, what a return value is, and how Java stores and converts primitive data.

15–25% of exam