这个 Java 项目如何使用语言保留字作为标识符?

How is this Java project using the language reserved words as identifiers?

我使用 JD-GUI 反编译了一个 Java 项目,当我看到所有标识符都使用 Java 保留关键字时感到惊讶,例如 int do throw extends 等..

这是该项目的一个片段:

public class try extends Thread {
  private int do;
  
  private JSONArray if;
  
  private int for;
  
  private String int;
  
  private String new;
}

我在另一个post上读到关于使用 UTF-16 编码时,某些字符可能看起来相同,但实际上不同,所以我使用 Notepad++ 切换了编码,但这对显示没有影响.

我也尝试使用 Github 中的一些去混淆器,但没有成功。

我知道这不是真的使用保留关键字,但我想不通,所以这里有什么技巧?

编辑:

这里是项目中最小的class:

package tech.iresponse.break;

import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.log4j.Logger;

public class do {
  public static void do(Throwable paramThrowable) {
    Logger.getLogger("rootLogger").error(ExceptionUtils.getFullStackTrace(paramThrowable));
  }
}


/* Location:              C:\Users\User\Desktop\app.jar!\tech\iresponse\break\do.class
 * Java compiler version: 8 (52.0)
 * JD-Core Version:       1.1.3
 */

这里是十六进制转储:

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00001490

虽然保留字可能不会出现在 Java 源代码中,但它们可以出现在已编译的 Java 代码中。一些代码混淆工具可以利用它来增加反编译的难度。例如,ProGuard 提供以下选项:

-obfuscationdictionary filename

Specifies a text file from which all valid words are used as obfuscated field and method names. By default, short names like 'a', 'b', etc. are used as obfuscated names. With an obfuscation dictionary, you can specify a list of reserved key words, or identifiers with foreign characters, for instance. White space, punctuation characters, duplicate words, and comments after a# sign are ignored. Note that an obfuscation dictionary hardly improves the obfuscation. Decent compilers can automatically replace them, and the effect can fairly simply be undone by obfuscating again with simpler names. The most useful application is specifying strings that are typically already present in class files (such as 'Code'), thus reducing the class file sizes just a little bit more. Only applicable when obfuscating.

因此,如果您为其提供一个包含 Java 标识符(例如 this one)的列表,您最终会得到一个 class 文件,如果反编译,该文件会导致语法错误。当然,你可以简单地重命名变量来修复这些编译错误(比如在反编译前自己使用ProGuard),所以这只是一个小小的不便。