工厂模式

  1. interface Human{
  2.     public void eat();
  3.     public void sleep();
  4.     public void beat();
  5. }
  7. // 创建实现类 Male
  8. class Male implements Human{
  9.     public void eat(){
  10.         System.out.println("Male can eat."); 
  11.     }
  12.     public void sleep(){
  13.         System.out.println("Male can sleep.");
  14.     }
  15.     public void beat(){
  16.         System.out.println("Male can beat.");
  17.     }
  18. } 
  19. //创建实现类 Female
  20. class Female implements Human{
  21.     public void eat(){
  22.         System.out.println("Female can eat."); 
  23.     }
  24.     public void sleep(){
  25.         System.out.println("Female can sleep.");
  26.     }
  27.     public void beat(){
  28.         System.out.println("Female can beat.");
  29.     }
  30. } 
  32. // 创建普通工厂类
  33. class HumanFactory{
  34.     public Human createHuman(String gender){
  35.         if( gender.equals("male") ){
  36.            return new Male();
  37.         }else if( gender.equals("female")){
  38.            return new Female();
  39.         }else {
  40.             System.out.println("请输入正确的类型！");
  41.             return null;
  42.         }
  43.     }
  44. }
  46. // 工厂测试类
  47. public class FactoryTest {
  48.     public static void main(String[] args){
  49.         HumanFactory factory = new HumanFactory();
  50.         Human male = factory.createHuman("male");
  51.         male.eat();
  52.         male.sleep();
  53.         male.beat();
  54.     }
  55. }

多个工厂模式

  1. // 多个工厂方法
  2. public class HumanFactory{
  3.     public Male createMale() {
  4.         return new Male();
  5.     }
  6.     public Female createFemale() {
  7.         return new Female();
  8.     }
  9. }
  11. // 工厂测试类
  12. public class FactoryTest {
  13.     public static void main(String[] args){
  14.         HumanFactory factory = new HumanFactory();
  15.         Human male = factory.createMale();
  16.         male.eat();
  17.         male.sleep();
  18.         male.beat();
  19.     }
  20. }

静态工厂模式

  1. // 多个工厂方法
  2. public class HumanFactory{
  3.     public static Male createMale() {
  4.         return new Male();
  5.     }
  6.     public static Female createFemale() {
  7.         return new Female();
  8.     }
  9. }
  11. // 工厂测试类
  12. public class FactoryTest {
  13.     public static void main(String[] args){
  14.         Human male = HumanFactory.createMale();
  15.         male.eat();
  16.         male.sleep();
  17.         male.beat();
  18.     }
  19. }

工厂模式应用

  1. java.util.Calendar - getInstance()
  2. java.util.Calendar - getInstance(TimeZone zone)
  3. java.util.Calendar - getInstance(Locale aLocale)
  4. java.util.Calendar - getInstance(TimeZone zone, Locale aLocale)
  5. java.text.NumberFormat - getInstance()
  6. java.text.NumberFormat - getInstance(Locale inLocale)