java泛型边界深入探讨，示例代码

package org.rui.generics.bounds;

import java.awt.Color;
/**
 * 边界
 * 下面展示了边界基本要素。
 * @author lenovo
 *
 */
interface HasColor{java.awt.Color getColor();}
class Colored<T extends HasColor>
{
	T item;
	Colored(T item){this.item=item;}
	T getItem(){return item;}
	java.awt.Color color(){return item.getColor();}
}
///////////////////////////////////////////////////
class Dimensio{public int x,y,z;}//尺码

//!class ColoredDimension<T extends HasColor & Dimensio>
class ColoredDimension<T extends Dimensio & HasColor>
{
	T item;
	ColoredDimension(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;}

}
///////////////立方体///////////////////////////////////////////////
interface Weight{int weight();}
class Solid<T extends Dimensio & 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 getWeight(){return item.weight();}
}
//////////////////////////////////////////////////////////////////////
class Bounded extends Dimensio implements HasColor,Weight
{
  public int weight(){return 0;}
  public Color getColor() {return null;}
}
//////////////////////////////////////////////////////////////////////////
public class BasicBounds {

	public static void main(String[] args)
	{
		Solid<Bounded> solid=new Solid<Bounded>(new Bounded());
		solid.color();
		solid.getY();
		solid.getWeight();
	}
}

package org.rui.generics.bounds;

import java.awt.Color;
/**
 * 边界
 * 看上去包含可以通过继承消除沉余。
 * 下面可以看到在继承的每个层次上添加边界的限制
 * @author lenovo
 *
 */
class holdItem<T>
{
 T item;
 holdItem(T item){this.item=item;}
 T getItem(){return item;}
}

interface HasColor2{java.awt.Color getColor();}
class Colored2<T extends HasColor2> extends holdItem<T>
{

	//T item;
	Colored2(T item){super(item);}
	//T getItem(){return item;}
	java.awt.Color color(){return item.getColor();}
}
///////////////////////////////////////////////////
class Dimensio2{public int x,y,z;}//尺码

class ColoredDimension2<T extends Dimensio2 & HasColor2> extends Colored2<T>
{
	ColoredDimension2(T item){super(item);}
	int getX(){return item.x;}
	int getY(){return item.y;}
	int getZ(){return item.z;}
}
///////////////立方体///////////////////////////////////////////////
interface Weight2{int weight();}
class Solid2<T extends Dimensio2 & HasColor2 & Weight2> extends ColoredDimension2<T>
{
	Solid2(T item){super(item);}
	int getWeight(){return item.weight();}
}
//////////////////////////////////////////////////////////////////////
class Bounded2 extends Dimensio2 implements HasColor2,Weight2
{
  public int weight(){return 0;}
  public Color getColor() {return null;}
}
//////////////////////////////////////////////////////////////////////////
public class InheritBounds {

	public static void main(String[] args)
	{
		Solid2<Bounded2> solid=new Solid2<Bounded2>(new Bounded2());
		solid.color();
		solid.getY();
		solid.getWeight();
	}
}

package org.rui.generics.bounds;

import java.awt.Color;
import java.util.List;
/**
 * 边界
 * 多层次的示例
 * @author lenovo
 *
 */

interface SuperPower{}
//视觉
interface XRayVision extends SuperPower
{
	void seeThroughWalls();
}
//听力
interface SuperHearing extends SuperPower
{
	void hearSubtleNoises();
}
//闻
interface SuperSmell extends SuperPower
{
	void trackBysmell();
}

//////////英雄；男主角////////////////////////////////
class SuperHero<POWER extends SuperPower>
{
 	POWER power;
 	SuperHero(POWER power){this.power=power;}
 	POWER getPower(){return power;}
}
//////////侦查////////////////////////////////
class SuperSleuth<POWER extends XRayVision> extends SuperHero<POWER>
{
	 SuperSleuth(POWER power){super(power);}
	 void see(){power.seeThroughWalls();}
}

////////////犬//////////////////////////////
class CanineHero<POWER extends SuperHearing & SuperSmell>
extends SuperHero<POWER>
{
	CanineHero(POWER power){super(power);}
	void hear(){power.hearSubtleNoises();}
	void smell(){power.trackBysmell();}
}

///////////////////////////////////////
class SuperHearSmell implements SuperHearing,SuperSmell
{
	@Override
	public void trackBysmell() {}
	@Override
	public void hearSubtleNoises() {}
}
///////////////////////////////////////
class DogBoy extends CanineHero<SuperHearSmell>
{
	DogBoy() {super(new SuperHearSmell());}
}
//////////////////////////////////////////////////////////////////////////
public class EpicBattle {
	//bounds in generic methods
	static <POWER extends SuperHearing>
	void userSuperHearing(SuperHero<POWER> hero )
	{
		hero.getPower().hearSubtleNoises();
	}

	static <POWER extends SuperHearing & SuperSmell>
	void sperFind(SuperHero<POWER> hero)
	{
		hero.getPower().hearSubtleNoises();
		hero.getPower().trackBysmell();
	}

	public static void main(String[] args)
	{
		DogBoy dogboy=new DogBoy();
		userSuperHearing(dogboy);
		sperFind(dogboy);
		//YOU can do this
		List<? extends SuperHearing> audioBoys;
		//but you can 't do this:
		//List<? extends SuperHearing & SuperSemll> audioBoys;
	}
}

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