简单工厂模式（缺点：每增加一个具体产品时 ，就要修改工厂方法，工厂方法负责了所有具体产品的创建）
举个例子：
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public interface Fruit {
void grow();
void harvest();
void plant();
}
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public class Apple implements Fruit {
private int treeAge;
public void grow() {
// TODO Auto-generated method stub
System.out.println("Apple is growing...");
}
public void harvest() {
// TODO Auto-generated method stub
System.out.println("Apple has been harvested.");
}
public void plant() {
// TODO Auto-generated method stub
System.out.println("Apple has been planted.");
}
public int getTreeAge() {
return treeAge;
}
public void setTreeAge(int treeAge) {
this.treeAge = treeAge;
}
}
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public class Grape implements Fruit {
private boolean seedless;
public boolean isSeedless() {
return seedless;
}
public void setSeedless(boolean seedless) {
this.seedless = seedless;
}
public void grow() {
// TODO Auto-generated method stub
System.out.println("Grape is growing...");
}
public void harvest() {
// TODO Auto-generated method stub
System.out.println("Grape has been harvested.");
}
public void plant() {
// TODO Auto-generated method stub
System.out.println("Grape has been planted.");
}
}
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public class Strawberry implements Fruit {
public void grow() {
// TODO Auto-generated method stub
System.out.println("Strawberry is growing...");
}
public void harvest() {
// TODO Auto-generated method stub
System.out.println("Strawberry has been harvested.");
}
public void plant() {
// TODO Auto-generated method stub
System.out.println("Strawberry has been planted.");
}
}
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public class FruitGardener {
//静态工厂方法
public static Fruit factory(String which) throws BadFruitException{
if(which.equalsIgnoreCase("apple")){
return new Apple();
}
else if(which.equalsIgnoreCase("strawberry")){
return new Strawberry();
}
else if(which.equalsIgnoreCase("grape")){
return new Grape();
}
else{
throw new BadFruitException("Bad fruit request");
}
}
}
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public class BadFruitException extends Exception {
public BadFruitException(String msg){
super(msg);
}
}
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public class Client {
public static void main(String[] args){
try{
Fruit apple = (Fruit)FruitGardener.factory("Apple");
System.out.println("apple is class: " + apple.getClass().getName());
apple.plant();
apple.grow();
apple.harvest();
System.out.println();
Fruit grape = (Fruit)FruitGardener.factory("grape");
System.out.println("grape is class: " + grape.getClass().getName());
grape.plant();
grape.grow();
grape.harvest();
System.out.println();
Fruit strawberry = (Fruit)FruitGardener.factory("strawberry");
System.out.println("strawberry is class: " + strawberry.getClass().getName());
strawberry.plant();
strawberry.grow();
strawberry.harvest();
}catch(BadFruitException e){
e.printStackTrace();
}
}
}
2 工厂方法模式：解决了简单工厂模式的缺点， 将每一个具体产品的创建工作交给对应的具体工厂角色去解决
举个例子：
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public interface FruitGardener {
public Fruit factory();
}
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public class AppleGardener implements FruitGardener{
public Fruit factory() {
return new Apple();
}
}
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public class GrapeGardener implements FruitGardener{
public Fruit factory() {
return new Grape();
}
}
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public class StrawGardener implements FruitGardener{
public Fruit factory() {
return new Strawberry();
}
}
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public class Client {
private static FruitGardener applegardener, grapegardener, strawgardener;
private static Fruit apple, grape, strawberry;
public static void main(String[] args){
applegardener = new AppleGardener();
apple = applegardener.factory();
System.out.println("apple is class: " + apple.getClass().getName());
apple.plant();
apple.grow();
apple.harvest();
System.out.println();
grapegardener = new GrapeGardener();
grape = grapegardener.factory();
System.out.println("grape is class: " + grape.getClass().getName());
grape.plant();
grape.grow();
grape.harvest();
System.out.println();
strawgardener = new StrawGardener();
strawberry = strawgardener.factory();
System.out.println("strawberry is class: " + strawberry.getClass().getName());
strawberry.plant();
strawberry.grow();
strawberry.harvest();
}
}
3 抽象工厂模式：解决多产品簇问题
举个例子：
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public interface Fruit {
// public String getName();
}
public class NorthernFruit implements Fruit{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public NorthernFruit(String name) {
super();
// TODO Auto-generated constructor stub
this.name = name;
}
}
public class TropicalFruit implements Fruit{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public TropicalFruit(String name) {
super();
// TODO Auto-generated constructor stub
this.name = name;
}
}
public interface Veggie {
}
public class TropicalVeggie implements Veggie{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public TropicalVeggie(String name) {
super();
// TODO Auto-generated constructor stub
this.name = name;
}
}
public class NorthernVeggie implements Veggie{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public NorthernVeggie(String name) {
super();
// TODO Auto-generated constructor stub
this.name = name;
}
}
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public interface Gardener {
public Fruit createFruit(String name);
public Veggie createVeggie(String name);
}
public class NorthernGardener implements Gardener {
public Fruit createFruit(String name) {
return new NorthernFruit(name);
}
public Veggie createVeggie(String name) {
return new NorthernVeggie(name);
}
}
public class TropicalGardener implements Gardener {
public Fruit createFruit(String name) {
return new TropicalFruit(name);
}
public Veggie createVeggie(String name) {
return new TropicalVeggie(name);
}
}
public class Client {
private static Gardener tropicalgardener ,northerngardener;
private static Fruit northernfruit, tropicalfruit;
private static Veggie northernveggie, tropicalveggie;
public static void main(String[] args){
tropicalgardener = new TropicalGardener();
tropicalfruit = tropicalgardener.createFruit("tropicalfruit");
//System.out.println(tropicalfruit.getName());
tropicalveggie = tropicalgardener.createVeggie("tropicalveggie");
northerngardener = new NorthernGardener();
northernfruit = northerngardener.createFruit("northernfruit");
northernveggie = northerngardener.createVeggie("northernveggie");
}
}