OnJava8-Examples/generics/ApplyFunctional.java

// generics/ApplyFunctional.java
// (c)2020 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.
import java.util.*;
import java.util.stream.*;
import java.util.function.*;
import onjava.*;

public class ApplyFunctional {
  public static void main(String[] args) {
    Stream.of(
      Stream.generate(Shape::new).limit(2),
      Stream.generate(Square::new).limit(2))
      .flatMap(c -> c) // flatten into one stream
      .peek(Shape::rotate)
      .forEach(s -> s.resize(7));

    new FilledList<>(Shape::new, 2)
      .forEach(Shape::rotate);
    new FilledList<>(Square::new, 2)
      .forEach(Shape::rotate);

    SimpleQueue<Shape> shapeQ = Suppliers.fill(
      new SimpleQueue<>(), SimpleQueue::add,
      Shape::new, 2);
    Suppliers.fill(shapeQ, SimpleQueue::add,
      Square::new, 2);
    shapeQ.forEach(Shape::rotate);
  }
}
/* Output:
Shape 0 rotate
Shape 0 resize 7
Shape 1 rotate
Shape 1 resize 7
Square 2 rotate
Square 2 resize 7
Square 3 rotate
Square 3 resize 7
Shape 4 rotate
Shape 5 rotate
Square 6 rotate
Square 7 rotate
Shape 8 rotate
Shape 9 rotate
Square 10 rotate
Square 11 rotate
*/