OnJava8-Examples/patterns/recyclea/RecycleA.java

// patterns/recyclea/RecycleA.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Recycling with reflection.
// {java patterns.recyclea.RecycleA}
package patterns.recyclea;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;
import patterns.trash.*;

class SimpleFactory {
  static final
  List<Function<Double, Trash>> constructors =
    Arrays.asList(
      Aluminum::new, Paper::new, Glass::new);
  static final int SIZE = constructors.size();
  private static SplittableRandom rand =
    new SplittableRandom(42);
  public static Trash random() {
    return constructors
      .get(rand.nextInt(SIZE))
      .apply(rand.nextDouble());
  }
}

public class RecycleA {
  public static void main(String[] args) {
    List<Trash> bin =
      Stream.generate(SimpleFactory::random)
        .limit(10)
        .collect(Collectors.toList());
    Bins bins = new Bins(bin);
    bins.show();
  }
}
/* Output:
Aluminum weight: 0.34 * price: 1.67 = 0.57
Aluminum weight: 0.62 * price: 1.67 = 1.03
Aluminum weight: 0.49 * price: 1.67 = 0.82
Aluminum weight: 0.50 * price: 1.67 = 0.83
Total Aluminum value = 3.26
Paper weight: 0.69 * price: 0.10 = 0.07
Total Paper value = 0.07
Glass weight: 0.16 * price: 0.23 = 0.04
Glass weight: 0.87 * price: 0.23 = 0.20
Glass weight: 0.80 * price: 0.23 = 0.18
Glass weight: 0.52 * price: 0.23 = 0.12
Glass weight: 0.20 * price: 0.23 = 0.05
Total Glass value = 0.59
Total Cardboard value = 0.00
Glass weight: 0.16 * price: 0.23 = 0.04
Aluminum weight: 0.34 * price: 1.67 = 0.57
Glass weight: 0.87 * price: 0.23 = 0.20
Glass weight: 0.80 * price: 0.23 = 0.18
Aluminum weight: 0.62 * price: 1.67 = 1.03
Aluminum weight: 0.49 * price: 1.67 = 0.82
Glass weight: 0.52 * price: 0.23 = 0.12
Glass weight: 0.20 * price: 0.23 = 0.05
Aluminum weight: 0.50 * price: 1.67 = 0.83
Paper weight: 0.69 * price: 0.10 = 0.07
Total Trash value = 3.91
*/