import java.util.Random;

/** Individual.java - For this example, we just want an array of 10 integers.
 */

public class Individual
{
  public static final int SIZE = 10;
  public static final int LOW = 1;
  public static final int HIGH = 5000;
  public int [] a;
  public int fitness;
  
  /** Default constructor:  Create 10 integers, each selected randomly. 
   */
  public Individual()
  {
    a = new int[SIZE];
    
    for (int i = 0; i < SIZE; ++i)
      a[i] = randomAlleleValue();
    
    // Calculate my fitness.
    this.fitness = this.findFitness();
  }
  
  /** randomAlleleValue - for this example we want a random
   *  number in the range 1..5000 or LOW..HIGH in general.
   */
  public static int randomAlleleValue()
  {
    // Use the system clock to set the random number generator.
    Random gen = new Random(System.nanoTime());
    
    return gen.nextInt(HIGH - LOW + 1) + LOW;
  }
  
  /** findFitness - Find the fitness of one individual, this.
   *  For this simple exercise, this will mean how many
   *  numbers in my array end in 8 or 9.
   *  Also store result in the fitness attribute.
   */
  public int findFitness()
  {
    int count = 0;
    for (int i = 0; i < SIZE; ++i)
      if (a[i] % 10 == 8 || a[i] % 10 == 9)
        ++count;
    this.fitness = count;
    
    return count;
  }
  
  /** toString - show the fitness value and the alleles.
   *  Be careful with the syntax.
   */
  public String toString()
  {
    StringBuilder sb = new StringBuilder();
    sb.append(String.format("fitness %2d (", this.findFitness()));
    for (int i = 0; i < SIZE - 1; ++i)
      sb.append(String.format("%d, ", a[i]));
    sb.append(String.format("%d)", a[SIZE - 1]));
    return sb.toString();
  }
}