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Byron's CSC212 Web Site
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Programming Challenge Archive
Application Architecture
Object Oriented Architecture
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\subsubsubsection
JavaApplication --
Percent White
// General Information
// ---------------------------------------------------
// File: PercentWhiteApp.java
// Type: java application file
// Date: Mon Oct 23, 2000
// Name: Byron Bahr
// Line: Die Area - Object Oriented Applic Arch
// Application Description
// ---------------------------------------------------
/*
The "Standard Die" Area Problem
This program finds the white area of a Die when
the Diameter of the Dots is 1/5 the Edge Length.
Programming Approach
The program will read an value corresponding to
n, the edge length of the Die. It will compute
the white area of the die and print it.
Featured Application Architecture
Object Oriented
*/
// Required Packages
// ---------------------------------------------------
import blue.io.*;
import blue.math.*;
import blue.shapes.*;
import java.lang.*;
// Application Class
// ---------------------------------------------------
class PercentWhiteApp
{
// The Main Method
static public void main (String args[])
{
IO.println("Edge Length? ");
Die d = new Die(IO.read_double());
IO.print("The Die is ");
IO.print(d.whitePercent());
IO.println(" percent white.");
}
}
class Die
{
// Instance Variables
private double totalArea;
private double blackArea;
private double whiteArea;
// Constructers
public Die(double edge)
{
// Declare Given Information
int nrFaces = 6;
int nrDots = 21;
// Define the radius of a Dot
double diameter = edge/5;
// Compute the area of a dot
Circle dot = new Circle(diameter/2.0);
// Compute the area of a Die Face
Square face = new Square(edge);
// Compute the total area of the Die faces
totalArea = face.area() * nrFaces;
// Compute the black area of the Die
blackArea = dot.area() * nrDots;
// Compute the white area of the Die
whiteArea = totalArea - blackArea;
}
// Define White Percent
public double whitePercent()
{
return ((whiteArea/totalArea) * 100);
}
}
// Demo
// ---------------------------------------------------
/*
The Die Edge Length? 1.79
The Die is 89.00442571243572 percent white.
The edge length? 5.43
The Die is 89.00442571243572 percent white.
*/
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