Question

http://www.theserverside.com/news/1321158/A-beginners-guide-to-Dependency-Injection”>beginners Guide to Dependency Injection 我遇到了一些新的建筑,我确信,我完全理解:

 // Instantiate CabAgency, and satisfy its dependency on an airlineagency.

 Constructor constructor = cabAgencyClass.getConstructor
  (new Class[]{AirlineAgency.class});
 cabAgency = (CabAgency) constructor.newInstance
  (new Object[]{airlineAgency});

什么是<条码>新等级[]{字典> 实际含义如何?

I understand that its goal is to create a Constructor instance for AirlineAgency.class but how does the syntax new Class[]{} achieve this?

当只有一个物体时,为什么阵列概念[]?

The What is the {} syntax here? 为什么没有<代码>(?

Answer 1

<代码>新级[]{航空机构。 } 创建了一个包含一个阵容的阵容阵列物体,并初步确定了唯一要成为AirlineAgency.}的内容。该编码与<代码>new int[]{42 }相似。

该法典基本上相当于:

Class[] parameterTypes = new Class[1];
parameterTypes[0] = AirlineAgency.class;

Constructor constructor = cabAgencyClass.getConstructor(parameterTypes);

Object[] arguments = new Object[1];
arguments[0] = airlineAgency;

cabAgency = (CabAgency)constructor.newInstance(arguments);

Classget.Constructor 这种方法要求建筑商采用一系列参数类型(寻找使用权重),类似Constructor.newInstance<<<<>a>希望有一系列论点。这就是为什么它这样做的原因。

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