The exam is cumulative with an emphasis on the topics covered since the last exam: interfaces, inheritance, polymorphism, basic collections, generics (Lectures 6-8)

Command-line Arguments

Interfaces

• What they are
• Their syntax
• Implementing an interface
• Interface Inheritance
• Abstract Classes and methods
  • What they are
  • Their relationship with interfaces and concrete classes
  • You will not be asked to write any code using an abstract class

Class Inheritance

• Superclasses/subclasses
• class hierarchies
  • Object as the root of the Java class hierarchy
• protected
• up/downcasting
• overriding methods
  • overloading vs overriding
• You should understand the differences and consequences of creating a class using composition, inheritance or 'standalone' (i.e., starting from scratch with no relationship)
• use of super

Polymorphism

• Rule of Polymorphism: method resolution is based on the (runtime/dynamic) type of the object and not the (static/compile-time) type of the receiver reference variable.

ArrayList

• You should know the differences between an ArrayList and an array
• creating
• You should know the following methods: add(val), add(int index, Object val), get(int index), set(int index, Object val), remove(Object val), remove(int index) contains(Object val), size(), isEmpty()
• You should be able to code a simple app using an ArrayList (e.g. Lab 8)

Generics & Autoboxing

• You should understand how generics and autoboxing each simplify using colections like ArrayList
• You should understand raw vs generic ArrayList
• You should be able write the correct code to insert an object (e.g., a String) into a raw ArrayList as well as extract it (requiring downcasting) (and of course into a generic ArrayList of the correct type..
  • You should understand why putting thing into a (raw) collection is an upcast, while removing from a collection requires a downcast

Labs and Lecture Notes Code

• And as always, all the labs and sample code in the lecture notes are fair game for questions (except Lab 5 -- the maze; though I might throw in an extra-credit question on that)e
• and although I did say the exam is cumulative, I want to stress that you need to be able to code class definition.