Computer Science 120 Class Examples

Class Examples

Class examples will be linked below. Please report any missing examples.

Java and Objectdraw Basics

TouchyWindow - basic event handlers and Text object
ColorEvents - more graphics primitives, more event handlers, setting colors.
SunAndMoon - moving objects in response to events
MouseDroppings - accessing the mouse location
Spirograph - remembering a mouse location in an instance variable
Scribble - update the saved location on each drag event
RubberBand - changing the endpoint of a line
ClickCounter - using an int variable, changing the contents of a Text object, constructing a string from an int

Conditionals and Numbers

Rectangles - basic conditional, the null object
NudgeBall - testing for containment of a point in a graphics object
ColorfulSpirograph - RandomIntGenerator to select among a limited set of colors
MoreColorfulSpirograph - generating a custom color (randomly)
CrazyColorfulSpirograph - even more random colors
UglyDragABall - dragging an object, but not very nicely
DragABall - dragging an object much more nicely
Basketball - more interesting dragging application
Basketball2 - dynamic canvas size, font sizes, centering objects
ColorfulSunset - doing math on color
FourVoting - more complicated conditionals

Defining Classes

Repetition and Active Objects

RailroadClick - click to cause repetition
Railroad - a while loop for repetition
PerspectiveRR - railroad tracks with perspective
GraphGrid - two while loops to create graph paper
RandomOvalsOnClick - a while loop to draw 1000 dots with random colors and random positions on each click
Knitting - a nested loop structure
FlagMaker - more nested loops, private methods
FallingBalls - a simple ActiveObject of falling objects
VanishingScribble - a scribble program enhanced with some active objects
PatheticPong - first attempt at a pong game, this one with a paddle that does not interact with the ball
LessPatheticPong - the ball can now be struck by the paddle
Pong - the ball can now bounce off the walls
TiltPong - communicating with the active object in pong
Snowman - importing and using graphical images
FallingSnow - multiple active objects

The static Keyword

Collections

FallingSnowFor - a for loop in the falling snow example
Drag4Shirts - ArrayList motivation
Drag4ShirtsArrayList - ArrayList introduction
Drag10Shirts - ArrayList example
DrawRoads - draw segments of roads, using a loop to draw center lines
DragRoads - drag a segment of road, uses ArrayList to store road segment components
DragAllRoads - drag any segment of road, also uses ArrayList to store all road segments
DragAllRoadsRemove - add capability to remove road segments from the ArrayList
MovingFlags - adding a dragging capability to our flag example with ArrayLists
PongBricks - a pong game that can hit bricks
Drag10ShirtsArray - first array example
Drag10ShirtsNicer - array with initializer
Drag20Shirts - reuse colors using modulo arithmetic
DragStudentsS12 - drag around pictures of students, using a random non-overlapping placement

2D Arrays

TicTacToe - 2D array example
Breakout - a breakout game using 2D arrays and lots of other fun things
BetterBreakout - an improved breakout game, with a turn counter, as developed in class

Strings and File I/O

Hangman - a text-based hangman game, demonstrating some String methods, reading a file, reading from the keyboard
MakeOvals - create some ovals from an input file, demonstrating FileReader/BufferedReader and StringTokenizer
CountWords - count up the words in a file
Payroll - simple payroll computation

Examples of Potential Use on Projects