为一个类生成多个 .class 文件? [英] Multiple .class files generated for a class?

问题描述

出于好奇，为什么有时编译后会为一个类生成多个 Java .class 文件?例如，我的应用程序有六个类.对于一个班级，总共生成了 10 个 .class 文件，从 MyClass#1 到 MyClass#10.

Out of curiosity, why are sometimes multiple Java .class files generated for a class after compilation? For example, my application has six classes. For one class, a total of 10 .class files has been generated, starting from MyClass#1 up to MyClass#10.

推荐答案

这些适用于 内部类 和静态嵌套类.带数字的是匿名内部类.

These are for inner classes and static nested classes. The ones with numbers are anonymous inner classes.

例如:

class Foo {
   class Bar { }
   static class Baz { }
   void run() {
      Helper t = new Helper() {
         int helpMethod() {
            return 2;
         }
      };
    }
}

这将生成类文件 Foo.class、Foo$Bar.class、Foo$Baz.class 和 Foo$1.class(用于实现Helper接口)

This will produce class files Foo.class, Foo$Bar.class, Foo$Baz.class and Foo$1.class (for the implementation of the Helper interface)

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