SE1011Week 6, Class 1 Today

Return Half Exam 2 (cont.) Object Oriented Programming (cont.) Muddiest Point

Next Half Exam: Week 7, Monday

SE-1011 Slide design: Dr. Mark L. Hornick Instructor: Dr. Yoder 1

Muddiest PointHow the class return the value to the main program? How to choose this variables to be returned? return valuehow to use the info we generated in clock ideas into separate pieces of code design to codeformatter versus printf formatterHow does any of this actually work? seeing Clock in action would have helped. clock in actionHardest part to me would be what is "private" exactly? public/privateWhere to create a new class for an object, and when to incorporate that info into the main class multiple classesThe first part of the lecture, how to differentiate between an object and an instance o a class object/instance

2

Muddiest Point (2)more uses for formater? formatterJava standards on what to make public and what to make private public/privatedo you have to make a separate class for the objects you create?

multiple classes

how are you supposed to get the clock to count and show on its own. clock in actionpublic vs. private\ public/privateWhat exactly is an address? Are they useful? addressshould the lab be in console or GUI? lab 5Are methods just functions in a class? methods

3

IEEE Xtreme Competition

24 hour programming competition Deadline for registration is tomorrow – see

your email I will proctor a few hours of the competition If you have prior programming experience, I

recommend the competition If you have lots of free time, I also

recommend it, regardless of your experience level

SE-1011 Slide design: Dr. Mark L. Hornick Instructor: Dr. Yoder 4

Object Oriented Programming

Why use object oriented programming (OOP)? Natural way to

model real-world objects describe computing components

Encapsulation! Present clean interface and behavior to users Users don't have to know internals to use Helps detect and correct for errors

SE-1011 Slide design: Dr. Mark L. Hornick Instructor: Dr. Yoder 5

What is an Object?

A class defines a new type of object An object is an instance of a class with

its own values for instance variables behaviors performed using its own instance

variables Unlike primitive …

types, class types are defined based on other types, and define behaviors

values, objects have behaviors variables, a variable with a class type actually

holds a reference, not the object directly 6

How to copy a class?

SE-1011 Slide design: Dr. Mark L. Hornick Instructor: Dr. Yoder 7

12

inputHour

int

285638

Clock

11

hours

int

31

minute

int

285652

Clock

11

hours

int

31

minute

int

SE1011Week 6, Class 1

Clock ref

clock

Clock ref

clock2

285638

285652

main(…)

SE-1011 Slide design: Dr. Mark L. Hornick Instructor: Dr. Yoder 8

Acknowledgement

This course is based on the text

Introduction to Programming with Java by Dean & Dean, 2nd Edition

SE-1011 Slide design: Dr. Mark L. Hornick Instructor: Dr. Yoder 9