OnJava8-Examples/generics/InheritBounds.java

// generics/InheritBounds.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.

class HoldItem<T> {
  T item;
  HoldItem(T item) { this.item = item; }
  T getItem() { return item; }
}

class WithColor2<T extends HasColor>
extends HoldItem<T> {
  WithColor2(T item) { super(item); }
  java.awt.Color color() { return item.getColor(); }
}

class WithColorCoord2<T extends Coord & HasColor>
extends WithColor2<T> {
  WithColorCoord2(T item) {  super(item); }
  int getX() { return item.x; }
  int getY() { return item.y; }
  int getZ() { return item.z; }
}

class Solid2<T extends Coord & HasColor & Weight>
extends WithColorCoord2<T> {
  Solid2(T item) {  super(item); }
  int weight() { return item.weight(); }
}

public class InheritBounds {
  public static void main(String[] args) {
    Solid2<Bounded> solid2 =
      new Solid2<>(new Bounded());
    solid2.color();
    solid2.getY();
    solid2.weight();
  }
}