簡單工廠模式（缺點：每增加一個具體產品時 ，就要修改工廠方法，工廠方法負責了所有具體產品的創建）
舉個例子：
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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 {
?//靜態工廠方法
?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 工廠方法模式：解決了簡單工廠模式的缺點， 將每一個具體產品的創建工作交給對應的具體工廠角色去解決
舉個例子：
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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 抽象工廠模式：解決多產品簇問題
舉個例子：
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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");
?}
?
}