查询词典 upcasting

And upcasting from 'CDerived1 *' to 'CBase1 *' is always safe, thus can be converted trivially.

从'向上转型CDerived1 *'到'CBase1 *'永远是安全的，因此可以转换平凡。

There is upcasting mechanism, it just extracts dictionary of a base class from a dictionary tuple, so you can run a function that requires base class from a function that requires subclass

有一个向上转型机制，从字典对中取出基类的字典，于是对子类参数调用基类参数的函数成为可能。

The rest of the code works the same. It doesn't matter if you are upcasting to a "regular" class called Instrument , an abstract class called Instrument , or to an interface called Instrument . The behavior is the same.

剩余部分的代码还是一样的运转执行，不管将对象上传转化为了普通的 Instrument 类或者 Instrument 的抽象类都无不影响程序正常运行。

I.play;} static void tuneAll(Instrument3 e){ for(int i = 0; i e.length; i++) tune;} public static void main { Instrument3 orchestra = new Instrument3[5]; int i = 0;// Upcasting during addition to the array: orchestra = new Wind3; orchestra = new Percussion3; orchestra = new Stringed3; orchestra = new Brass3; orchestra = new Woodwind3; tuneAllorchestra

如果是为了适应新类的要求，那么对基础类接口进行操纵的方法根本不需要改变，对于乐器例子，假设我们在基础类里加入更多的方法，以及一系列新类，那么会出现什么情况呢？

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采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

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