Intro to Programming -- Wednesday of 1st Week

What is programming?

• Writing a computer program (set of instructions).

What is a program?

• A written document that a computer can read, interpret, and act on as a set of instructions.
• Humans must be able to read it too!

Rhetorical Styles:

• OOP (Object-oriented programming)
• OOD (Object-oriented design, analogous to outline, storyboard)

Language:

• Java (audience: computer, human(s))
• Object Diagrams

Development Environment:

• Eclipse (can also use BlueJ)
• (see diagrams)

What is a program?

  In OOP, a running program is a collection of objects that work together to perform a task.

• What is an object? 
• How do they work together?

Object = State + Operations

  State:

• info about the object
• parts it is composed of
• attributes that make this object different from others like it, e.g., color, material, size
• state between operations, e.g., open/closed, running/still
• list of other objects with which it interacts and communicates, e.g., list of contents

  Operations:

• tasks involving this object
• what you do to an object, e.g., open it, close it, move it
• what you ask an object to do, e.g., tell me your color, your size, your location; move yourself, open up, add this to your list of contents
• special operations: constructors

What is a Class?

• describes state and operations for one or more objects (a class, or category, of objects)