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Java Source Code / Java Documentation » Development » jgap » examples.multidimension 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   examples.multidimension.KnapsackMain

KnapsackMain
public class KnapsackMain (Code)
This class provides an implementation of the extended classic knapsack problem using a genetic algorithm. The goal of the problem is to reach a given volume (of a knapsack) by putting a number of items into the knapsack. The closer the sum of the item volumes to the given volume the better.

The extension to the classic knapsack is that each item can have a specific color. The fewer colors the items in the packed knapsack have, the better the solution is regarded.

For further descriptions, compare the "coins" example also provided.
author:
   Klaus Meffert
since:
   3.0



Field Summary
final public static  String[]COLORS
    
final public static  String[]itemNames
    
final public static  double[]itemVolumes
    


Method Summary
public static  voidfindItemsForVolume(double a_knapsackVolume, int a_numCols)
     Executes the genetic algorithm to determine the minimum number of items necessary to make up the given target volume.
public static  voidmain(String[] args)
     Main method.

Field Detail
COLORS
final public static String[] COLORS(Code)



itemNames
final public static String[] itemNames(Code)
Names of arbitrary items, only for outputting something imaginable



itemVolumes
final public static double[] itemVolumes(Code)
Volumes of arbitrary items in ccm





Method Detail
findItemsForVolume
public static void findItemsForVolume(double a_knapsackVolume, int a_numCols) throws Exception(Code)
Executes the genetic algorithm to determine the minimum number of items necessary to make up the given target volume. The solution will then be written to the console.
Parameters:
  a_knapsackVolume - the target volume for which this method isattempting to produce the optimal list of items
Parameters:
  a_numCols - max. number of colors being available for items
throws:
  Exception -
author:
   Klaus Meffert
since:
   3.0



main
public static void main(String[] args)(Code)
Main method. A single command-line argument is expected, which is the volume to create (in other words, 75 would be equal to 75 ccm).
Parameters:
  args - first element in the array = volume of the knapsackto fill as a double value, second element = max. no. of colors
author:
   Klaus Meffert
since:
   3.0



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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