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

问题描述

我一直在使用Eclipse作为我的开发IDE。我也使用它将我的应用程序导出为.jar文件。当我在.jar文件中查看我的类时，我的几个类包含该类的名称，一个美元符号，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:

• 查找$ 1.class


• 查找$ 2.class


• 查找$ 3.class


• Find.class

• Find$1.class
• Find$2.class
• Find$3.class
• Find.class

这在更大的类。这是因为类变得这么大，它编译成多个类吗？我已经google和查看多个论坛，并搜索Java文档，但没有找到任何与它相关的东西。有人可以解释吗？

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

如果类中存在任何内部类将被编译，类文件将 ClassName $ InnerClassName ，假设匿名内部类将显示为数字，类（Java代码）的大小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, incase of Anonymous inner classes it will appear as numbers, size of the Class (Java Code) doesn't lead to generation of multiple classes.

例如给定这段代码：

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
4. 
   

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

更新：

使用匿名类不被视为不良做法，取决于用途。

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

检查此对SO

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