这个Java项目是如何使用语言保留字作为标识符的？
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，例如 int do throw extends 等时，我感到很惊讶。
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;
}
我在另一篇关于使用 UTF-16 编码时的文章中读到，有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。
我知道它并没有真正使用保留关键字，但我无法弄清楚，所以这里的技巧是什么？
编辑：
这是项目中最小的类：
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:UsersUserDesktopapp.jar!techiresponsebreakdo.class
* Java compiler version: 8 (52.0)
* JD-Core Version: 1.1.3
*/
这是十六进制转储：
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00000e30 00 6c 57 a7 00 26 2b 19 0b bb 00 27 59 b7 00 4c |.lW..&+....'Y..L|
00000e40 12 10 b6 00 4f 19 09 b4 00 39 b6 00 4f 12 0d b6 |....O....9..O...|
00000e50 00 4f b6 00 50 b6 00 6a 57 15 0a 99 00 1a 19 09 |.O..P..jW.......|
00000e60 19 06 b5 00 40 19 09 19 07 b5 00 3a 19 09 b6 00 |....@......:....|
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00000e90 3a 19 09 b6 00 5d 57 84 08 01 a7 fd cf 2b bb 00 |:....]W......+..|
00000ea0 27 59 b7 00 4c 19 04 b6 00 4f 12 02 b6 00 4f b6 |'Y..L....O....O.|
00000eb0 00 50 b6 00 6c 57 2b bb 00 27 59 b7 00 4c 19 04 |.P..lW+..'Y..L..|
00000ec0 b6 00 4f 12 03 b6 00 4f b6 00 50 b6 00 6c 57 2b |..O....O..P..lW+|
00000ed0 c6 00 3c 2b b6 00 6b 99 00 35 2b b6 00 69 a7 00 |..<+..k..5+..i..|
00000ee0 2e 4d 2c b8 00 58 2b c6 00 25 2b b6 00 6b 99 00 |.M,..X+..%+..k..|
00000ef0 1e 2b b6 00 69 a7 00 17 3a 0c 2b c6 00 0e 2b b6 |.+..i...:.+...+.|
00000f00 00 6b 99 00 0
回答
虽然保留字可能不会出现在 Java 源代码中，但它们在已编译的 Java 代码中是允许的。一些代码混淆工具可以利用这一点使反编译更加困难。例如，ProGuard 提供以下选项：
-obfuscationdictionary filename
指定一个文本文件，其中的所有有效词都用作混淆的字段和方法名称。默认情况下，像“a”、“b”等短名称用作混淆名称。例如，使用混淆字典，您可以指定保留关键字列表或带有外来字符的标识符。# 符号后的空格、标点符号、重复词和注释将被忽略。请注意，混淆字典几乎不能改善混淆。体面的编译器可以自动替换它们，并且可以通过使用更简单的名称再次混淆来简单地消除效果。最有用的应用程序是指定通常已经存在于类文件中的字符串（例如“代码”），从而稍微减少类文件的大小。仅在混淆时适用。
因此，如果您为这个列表提供 Java 标识符（例如this），您最终会得到一个类文件，如果反编译会导致语法错误。当然，您可以简单地重命名变量以修复这些编译错误（例如，在反编译之前自己使用 ProGuard），因此这只是一个小小的不便。