java 部分类/部分类文件
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partial classes/partial class file
提问by Ravisha
In C# .net there is a provision to have two different class files and make them a single class using the keyword partial keyword.this helps it to keep [for ex]UI and logic seperate. of course we can have two classes to achieve this one for UI and other for logic. Can this be achieved in java some how?
在 C# .net 中，提供了两个不同的类文件，并使用关键字 partial 关键字使它们成为单个类。这有助于它保持 [例如] UI 和逻辑分离。当然，我们可以有两个类来实现这一点，一个用于 UI，另一个用于逻辑。这可以在java中实现吗？
回答by polygenelubricants
On source file splitting
关于源文件拆分
No. Java source codes can not be split across multiple files.
不可以。Java 源代码不能跨多个文件拆分。
From the Wikipedia article Comparison of Java and C Sharp
The Sun Microsystems Java compiler requires that a source file name must match the only public class inside it, while C# allows multiple public classes in the same file, and puts no restrictions on the file name. C# 2.0 and later allows a class definition to be split into several files, by using the partial keyword in the source code. In Java, a public class will always be in its own source file. In C#, source code files and logical units separation are not tightly related.
Sun Microsystems Java 编译器要求源文件名必须与其中唯一的公共类匹配，而 C# 允许同一文件中有多个公共类，并且对文件名没有限制。C# 2.0 及更高版本允许通过在源代码中使用 partial 关键字将类定义拆分为多个文件。在 Java 中，公共类将始终位于其自己的源文件中。在 C# 中，源代码文件和逻辑单元分离并不紧密相关。
On separating logic and UI into their own classes
关于将逻辑和 UI 分离到它们自己的类中
The two classes approach is a muchbetter solution than the one-class-two-source approach in this case, because the separation is enforced in the design, not just physical separation in the source codes.
两个类的方法是一个多比在这种情况下，一类双源的方法更好的解决方案，因为分离是在设计执行，在源代码中不只是物理分离。
