delphi中的单位与其他语言中的类是否相同？ [英] Are units in delphi same as classes in other languages?

问题描述

我需要编写一些Delphi代码，但是我没有使用Delphi的经验。我见过人们写一些代码，称为 unit1 或 unit2 并使用其中的代码将其导入。因此，我可以将单元视为Java或C＃中的类吗？

I need to write some Delphi code, but I have no prior experience with Delphi. I've seen people writing some code, known as unit1 or unit2 and import it using the code inside them. So, can I see the unit as a class in Java or C#?

推荐答案

否。单元是Delphi中的源代码文件。本质上，您可以将其视为一个范围与当前文件完全相同的命名空间。

No. A unit is a source code file in Delphi. You can essentially think of it as a namespace whose scope is exactly the same as the current file.

在一个单元内，您可以使用类型定义语法来定义类。看起来像这样：

Within a unit, you can define classes, with type definition syntax. It looks like this:

type
  TMyClass = class(TParentClass)
  private
    //private members go here
  protected
    //protected members go here
  public
    //public members go here
  end;

任何方法都在类型声明下声明，而不是内联，这使代码更易于阅读，因为您

Any methods are declared below the type declaration, not inline, which makes the code easier to read because you can see the composition of a class at a glance instead of having to wade through its implementation.

此外，每个单元都有两个主要部分，称为界面和实施。可以在任一部分中放置类型声明，但是在界面中，实现代码无效。这允许使用类似于Java或C＃的公共和私有类的语言概念：在 interface 中声明的任何类型对使用此单元的其他单元（ public）可见，而在中声明的任何类型>实施仅在同一单元内可见。

Furthermore, each unit has two main sections, called interface and implementation. A type declaration can be placed in either section, but implementing code is not valid in interface. This allows for a language concept similar to Java's or C#'s public and private classes: any type declared in interface is visible to other units that use this unit ("public"), while any type declared in implementation is visible only within the same unit.

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