我们知道同为apple旗舰产品的iPhone和ipod其实差不太多，只是iPhone的配置相对高一些，同时多了通讯模块。那么上面的代码是否显得臃肿，没有设计，因为都是在创建对象的时候去设置其属性，而且这两款产品的属性似乎差不多，好像可以套用一样的生产线。
建造者模式 = buildX() + construct() + (optional)ifX()
第一次建造
增加一个基类Apple产品类，包含并集的所有零件的属性。
public class Apple {
private String camera;
private String touchScreen;
private String communication;
//省略getter，setter方法。增加一个abstract AppleBuilder类，包含Apple的成员对象。然后加入buildX方法，以及钩子方法ifX用来判断某些只有一些子类特有的属性。最后要加一个成员对象apple的获取方法。
注意：这个apple对象要定义为protected的原因是它的子类要直接使用这个对象。
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