// generics/BasicBounds.java

// (c)2016 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://mindviewinc.com/Books/OnJava/ for more book information.

interface HasColor { java.awt.Color getColor(); }

class WithColor<T extends HasColor> {

T item;

WithColor(T item) { this.item = item; }

T getItem() { return item; }

// The bound allows you to call a method:

java.awt.Color color() { return item.getColor(); }

}

class Coord { public int x, y, z; }

// This won't work. Class must be first, then interfaces:

// class WithColorCoord<T extends HasColor & Coord> {

// Multiple bounds:

class WithColorCoord<T extends Coord & HasColor> {

T item;

WithColorCoord(T item) { this.item = item; }

T getItem() { return item; }

java.awt.Color color() { return item.getColor(); }

int getX() { return item.x; }

int getY() { return item.y; }

int getZ() { return item.z; }

}

interface Weight { int weight(); }

// As with inheritance, you can have only one

// concrete class but multiple interfaces:

class Solid<T extends Coord & HasColor & Weight> {

T item;

Solid(T item) { this.item = item; }

T getItem() { return item; }

java.awt.Color color() { return item.getColor(); }

int getX() { return item.x; }

int getY() { return item.y; }

int getZ() { return item.z; }

int weight() { return item.weight(); }

}

class Bounded

extends Coord implements HasColor, Weight {

@Override

public java.awt.Color getColor() { return null; }

@Override

public int weight() { return 0; }

}

public class BasicBounds {

public static void main(String[] args) {

Solid<Bounded> solid =

new Solid<>(new Bounded());

solid.color();

solid.getY();

solid.weight();

}

}