Lecture Notes Two: Classes and Objects

The fundamental programming unit of the Java programming language is the class.

The lecture notes for today (on Classes and Objects) can be found here:

http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Eleven.html

Lecture Notes One

What computers can do and how. Programming languages. Java
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/One.html)

Lecture Notes Two

Algorithms. Programs. Mechanics of implementation in Java
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Two.html)

Lab One: Getting Started

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/One.html)

Lecture Notes Three

Objects and classes, reference types, symbolic names, variables declaration and their initialization through assignment
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Three.html)

Lecture Notes Four

Numbers. Strings. Reading input with ConsoleReader. ConsoleReader revealed (http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Four.html)

Lab Two: Some simple programs, some sample problems

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Two.html)

Homework Assignment One

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/assignments/A1.html)

Lecture Notes Five

Syntax. The structure of main
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Five.html)

Lecture Notes Six

Boolean values, expressions, and if statements
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Six.html)

Lab Three: Basic programs. Simulating decisions. Working with objects

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Three.html)

Lecture Notes Seven

Introduction to user-defined types. Classes
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Seven.html)

Lecture Notes Eight

Diagrams for object-oriented concepts
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Eight.html)

Lab Four: Classes and objects

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Four.html)

Homework Assignment Two

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/assignments/A2.html)

Lecture Notes Nine

Classes, objects, constructors
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Nine.html)

Lecture Notes Ten

Branches and paths. If statement exercises. (L)oops
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Ten.html)

Lab Five: Wrap-up of Classes and Objects material

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Five.html)

Lecture Notes Eleven

Java review by Dilbert
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Eleven.html)

Lecture Notes Twelve

Loops
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Twelve.html)

Lab Six: Nested loops, other loops, loops and a half, scalable letters

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Six.html)

Homework Assignment Three

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/assignments/A3.html)

Lecture Notes Thirteen

More practice with loops. Loops, tokenizers, and Monte Carlo problems
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Thirteen.html)

Lecture Notes Fourteen

Computer Games. (In which Tigger has guests from another tale).
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Fourteen.html)

Lab Seven: Loops, Strings, StringTokenizers.

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Seven.html)

Lecture Notes Fifteen

Designing Fractions.
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Fifteen.html)

Lecture Notes Sixteen

Milestones.
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Sixteen.html)

Homework Assignment Four

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/assignments/A4.html)

Lecture Notes Seventeen

Java arrays.
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Seventeen.html)

Lecture Notes Eighteen

Partially filled arrays. Array parameters and return values. Simple array algorithms.
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Eighteen.html)

Lab Eight: Procedures (Methods)

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/eEight.html)

Lecture Notes Nineteen

Java Fandango
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Nineteen.html)

Lecture Notes Twenty

Help with Homework Four
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/Twenty.html)

Lab Nine: Working with Methods and Arrays

(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Nine.html)

Lecture Notes Twenty-One

Parallel arrays. Arrays of object data. Vectors.
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/lectures/TwentyOne.html)

Lab Ten:

Classes and objects revisited.
(http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Ten.html)

(http://www.cs.indiana.edu/classes/a201-dger/)

Here's the problem for today. This problem has several parts:

1. Write a simple Vehicle class that has fields for (at least) current speed, current direction in degrees, and owner name.

2. Add a static field to your Vehicle class for the highest Vehicle Identification Number issued, and a non-static field that holds each vehicle's ID number.

3. Write a main method for your Vehicle class that creates a few vehicles and prints out their field values. Note that you can also write a separate tester program as well.

4. Add two constructors to Vehicle. A no-arg constructor and one that takes an initial owner's name. Modify the tester program from the previous step and test your design.

5. Make the fields in your Vehicle class private, and add accessor methods for the fields. Which fields should have methods to change them and which should not?

6. Add a changeSpeed method that changes the current speed of the vehicle to a passed-in value, and a stop method that sets the speed to zero.

7. Add two turn methods to Vehicle. One that takes a number of degrees to turn, and one that takes simply either a Vehicle.TURN_LEFT or a Vehicle.TURN_RIGHT constant. Define the two constants accordingly.

8. Add a static method to Vehicle that returns the highest identification number used so far.

9. Add a toString method to Vehicle.

Here's a collection of problems of increasing difficulty, to be used as a starting point:

• Warmups One (Solutions)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/warmups.html)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/warmsols.html)

• Problem Set One (Solutions)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/problems.html)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/probsol.html)

• Warmups Two (Solutions)
  (http://www.cs.indiana.edu/classes/a201-dger/sum2000/quizzes/Three2001.html)
  (http://www.cs.indiana.edu/classes/a201-dger/sum2000/quizzes/Three2001S.html)

• Problem Set Two (Solutions)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2001/assignments/SetTwo2001.html)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2001/assignments/setTwoSolutions2001.html)

• Overview of Classes and Objects
  (http://www.cs.indiana.edu/classes/a201-dger/sum2001/labs/RodS.html)

• Warmups Three (Solutions)
  (http://www.cs.indiana.edu/classes/a201-dger/sum2001/lectures/ifs.html)
  (http://www.cs.indiana.edu/classes/a201-dger/sum2001/lectures/ifsSol.html)

• Problem Set Three (Solutions)
  (http://www.cs.indiana.edu/classes/a201-dger/sum2001/lectures/pIfs.html)
  (http://www.cs.indiana.edu/classes/a201-dger/sum2001/lectures/pIfsSol.html)

• Sample Practical Problems
  (http://www.cs.indiana.edu/classes/a201-dger/spr2002/labs/Eight.html)

• More Practical Problems (Solutions)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2001/lectures/practical.html)
  (http://www.cs.indiana.edu/classes/a201-dger/spr2001/practical.html)

The URL for this module:

(http://www.cs.indiana.edu/classes/a348/CTED/moduleFour/)