java编译的类包含美元符号 [英] java compiled classes contain dollar signs

问题描述

我一直使用 Eclipse 作为我的开发 IDE.我还使用它来将我的应用程序导出到 .jar 文件中.当我查看 .jar 文件中的类时，我的一些类包含该类的名称、一个美元符号，然后是一个数字.示例:

I've been using Eclipse as my development IDE. I also use it to export my application into a .jar file. When I look at my classes in the .jar file, a few of my classes contain the name of that class, a dollar sign, then a number. Example:

• 找到$1.class
• 找到$2.class
• 找到$3.class
• 查找.class

我注意到它在更大的班级上做到了这一点.这是因为类变得太大，它编译成多个类吗?我用谷歌搜索并查看了多个论坛，并搜索了 Java 文档，但没有找到任何与之相关的内容.有人能解释一下吗?

I've noticed it does this on bigger classes. Is this because the classes get so big, it compiles it into multiple classes? I've googled and looked on multiple forums, and search the Java Documentation but have not found anything even related to it. Could someone explain?

推荐答案

内部类(如果您的类中存在任何内部类)将被编译并且类文件将为 ClassName$InnerClassName.在匿名内部类的情况下，它将显示为数字.类的大小(Java 代码)不会导致生成多个类.

Inner classes, if any present in your class, will be compiled and the class file will be ClassName$InnerClassName. In case of Anonymous inner classes, it will appear as numbers. Size of the Class (Java Code) doesn't lead to generation of multiple classes.

例如鉴于这段代码:

public class TestInnerOuterClass {
    class TestInnerChild{

    }

    Serializable annoymousTest = new Serializable() {
    };
}

将生成的类将是:

1. TestInnerOuterClass.class
2. TestInnerOuterClass$TestInnerChild.class
3. TestInnerOuterCasss$1.class

更新:

使用匿名类不被认为是一种不好的做法，它只是取决于用法.

Using anonymous class is not considered a bad practice ,it just depends on the usage.

检查这个 关于 SO 的讨论

Check this discussion on SO

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