java 设计模式分析

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创建型模式，共五种：工厂方法模式、抽象工厂模式、单例模式、建造者模式、原型模式。

单例模式

package javasasad;

public class Singleton_Design {
    public static void main(String[] args) {
           SingleA singleA =SingleA.getSingkeA();
   }


   static   class SingleA {
       static SingleA singleA;
       private SingleA() {
           // TODO Auto-generated constructor stub
           System.out.println("SingleA");
       }
       //单例生成

   public static SingleA getSingkeA() {
       if (singleA==null) {
           singleA=new SingleA();
       }
       return singleA;

   }
   }
}
抽象工厂模式

package javasasad;

public class Factory_Design {

   public static void main(String[] args) {
Factory factoryA =FactoryIMPL.getFactory(1);
Factory factoryB =FactoryIMPL.getFactory(2);

   }
   //抽象工厂
   static abstract class Factory{


   }

   public   static class FactoryA extends Factory{
       public FactoryA() {
           // TODO Auto-generated constructor stub
           System.out.println("FactoryA");
       }

   }

   public static class FactoryB extends Factory{
   public FactoryB() {
       // TODO Auto-generated constructor stub
       System.out.println("FactoryB");
   }
   }

public static class FactoryIMPL{

       public static Factory getFactory(int type) {
           switch(type){
           case 1:
               return new FactoryA();
           case 2:
               return new FactoryB();
          default:
              break;

           }

           return null;

       }
   }

}
其他三种比较简单不做分析

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