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CS1 Course Site
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Programming Challenge Archive
Application Architecture
Objective Application Architecture
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JavaApplication --
PercentWhite
// General Information
// ---------------------------------------------------
// File: percentWhite.java
// Type: java application file
// Date: Sun Oct 22, 2000
// Name: Kara Becker
// Line: Determine the percentage of white space on a die+
using objective application architecture.
// Application Description
// ---------------------------------------------------
/*
Determine the percentage of white space on a die using o+
bjective application architecture.
*/
// Required Packages
// ---------------------------------------------------
import blue.io.*;
import blue.shapes.*;
// Application Class
// ---------------------------------------------------
class percentWhite
{
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 int nrFaces = 6;
private int nrDots = 21;
private double edgeLength;
//Constructor.
public Die(double sideLength)
{
edgeLength = sideLength;
}
//Other methods.
public double whitePercent()
{
double diameter = (1.0 / 5.0) * edgeLength;
double totalArea = (edgeLength * edgeLength) * nrFaces;
Circle dot = new Circle(diameter / 2.0);
double dotArea = dot.area() * nrDots;
double whiteArea = totalArea - dotArea;
double percentWhite = (whiteArea / totalArea) * 100.0;
return percentWhite;
}
}
// Demo
// ---------------------------------------------------
/*
$ java percentWhite
Edge length?
1.79
The die is 89.00442571243572 percent white.
$ javac percentWhite.java
$ java percentWhite
Edge length?
5.43
The die is 89.00442571243572 percent white.
$
*/
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