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一.设计模式学习
1.抽象工厂模式学习
（1）举例 披萨项目
纽约与伦敦的加盟店生产不同口味的披萨

简单工厂模式：定义了一个创建对象的类，由这个类来封装实例化对象的行为这里写代码片
package com.java.jikexueyuan.pizzastore.absfactory;

import com.java.jikexueyuan.pizzastore.pizza.LDCheesePizza;
import com.java.jikexueyuan.pizzastore.pizza.LDPepperPizza;
import com.java.jikexueyuan.pizzastore.pizza.Pizza;

public class LDFactory implements AbsFactory {

@Override
public Pizza CreatePizza(String ordertype) {
    Pizza pizza = null;

    if (ordertype.equals("cheese")) {
        pizza = new LDCheesePizza();
    } else if (ordertype.equals("pepper")) {
        pizza = new LDPepperPizza();
    }
    return pizza;

}

}

package com.java.jikexueyuan.pizzastore.absfactory;

import com.java.jikexueyuan.pizzastore.pizza.Pizza;

public interface AbsFactory {
    public Pizza CreatePizza(String ordertype) ;
}

package com.java.jikexueyuan.pizzastore.absfactory;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import com.java.jikexueyuan.pizzastore.pizza.CheesePizza;
import com.java.jikexueyuan.pizzastore.pizza.GreekPizza;
import com.java.jikexueyuan.pizzastore.pizza.PepperPizza;
import com.java.jikexueyuan.pizzastore.pizza.Pizza;

public class OrderPizza {
    AbsFactory mFactory;

    public OrderPizza(AbsFactory mFactory) {

        setFactory(mFactory);
    }

    public void setFactory(AbsFactory mFactory) {
        Pizza pizza = null;
        String ordertype;

        this.mFactory = mFactory;

        do {
            ordertype = gettype();
            pizza = mFactory.CreatePizza(ordertype);
            if (pizza != null) {
                pizza.prepare();
                pizza.bake();
                pizza.cut();
                pizza.box();
            }

        } while (true);

    }

    private String gettype() {
        try {
            BufferedReader strin = new BufferedReader(new InputStreamReader(
                    System.in));
            System.out.println("input pizza type:");
            String str = strin.readLine();

            return str;
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }

}

总结：通过定义一个创建对象的抽象方法，由子类决定要实例化的类工厂模式的实例化。