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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00000f20 05 03 0a 03 1c 00 00 03 1c 03 1e 03 1c 00 00 00 |................|
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00000fa0 07 00 26 07 00 2e 07 00 26 07 00 2b 01 07 00 30 |..&.....&..+...0|
00000fb0 00 00 ff 00 15 00 0b 07 00 33 07 00 36 07 00 31 |.........3..6..1|
00000fc0 01 07 00 26 07 00 2e 07 00 26 07 00 2b 01 00 01 |...&.....&..+...|
00000fd0 00 00 ff 00 68 00 0b 07 00 33 07 00 36 07 00 31 |....h....3..6..1|
00000fe0 01 07 00 26 07 00 2e 07 00 26 07 00 2b 01 07 00 |...&.....&..+...|
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000010a0 01 00 ce 00 01 01 13 5b 00 05 73 01 03 73 01 17 |.......[..s..s..|
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00001170 00 05 03 ac 04 ac 00 00 00 01 00 d4 00 00 00 71 |...............q|
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000011c0 00 26 00 00 ff 00 09 00 00 00 00 fe 00 01 07 00 |.&..............|
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000011e0 00 07 00 26 07 00 26 00 00 ff 00 09 00 00 00 00 |...&..&.........|
000011f0 01 00 04 00 e1 00 b4 00 01 00 c8 00 00 00 11 00 |................|
00001200 01 00 02 00 00 00 05 2b c1 00 33 ac 00 00 00 00 |.......+..3.....|
00001210 00 01 00 e9 00 a5 00 01 00 c8 00 00 00 cf 00 02 |................|
00001220 00 06 00 00 00 69 10 3b 3c 04 3d 1c 10 3b 68 2a |.....i.;<.=..;h*|
00001230 b6 00 61 60 3d 2a b6 00 64 4e 1c 10 3b 68 2d c7 |..a`=*..dN..;h-.|
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00001250 68 2a b6 00 63 60 3d 2a b6 00 65 3a 04 1c 10 3b |h*..c`=*..e:...;|
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00001290 00 00 01 00 d4 00 00 00 54 00 06 ff 00 21 00 04 |........T....!..|
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000012c0 00 00 07 00 26 00 01 01 ff 00 04 00 01 07 00 33 |....&..........3|
000012d0 00 02 01 01 ff 00 15 00 06 00 00 00 00 00 07 00 |................|
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00001410 00 c8 00 00 00 12 00 02 00 02 00 00 00 06 2a 2b |..............*+|
00001420 b5 00 47 b1 00 00 00 00 00 01 01 10 00 a7 00 01 |..G.............|
00001430 00 c8 00 00 00 58 00 02 00 01 00 00 00 4c bb 00 |.....X.......L..|
00001440 27 59 b7 00 4c 12 15 b6 00 4f 2a b6 00 61 b6 00 |'Y..L....O*..a..|
00001450 4d 12 0c b6 00 4f 2a b6 00 64 b6 00 4e 12 0a b6 |M....O*..d..N...|
00001460 00 4f 2a b6 00 63 b6 00 4d 12 09 b6 00 4f 2a b6 |.O*..c..M....O*.|
00001470 00 65 b6 00 4f 12 0b b6 00 4f 2a b6 00 66 b6 00 |.e..O....O*..f..|
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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。
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：
00000000 ca fe ba be 00 00 00 34 01 19 08 00 9e 08 00 9f |.......4........|
00000010 08 00 a0 08 00 a1 08 00 a2 08 00 a3 08 00 a4 08 |................|
00000020 00 bd 08 00 be 08 00 bf 08 00 c0 08 00 c1 08 00 |................|
00000030 c2 08 00 c3 08 00 c4 08 00 c5 08 00 c6 08 00 c9 |................|
00000040 08 00 ca 08 00 cb 08 00 cd 08 00 d3 08 00 d5 08 |................|
00000050 00 d6 08 00 e2 08 00 ec 08 00 ed 08 00 ff 08 01 |................|
00000060 00 08 01 01 08 01 04 08 01 05 08 01 12 08 01 15 |................|
00000070 07 00 ef 07 00 f0 07 00 f1 07 00 f2 07 00 f3 07 |................|
00000080 00 f4 07 00 f5 07 00 f6 07 00 f7 07 00 fa 07 00 |................|
00000090 fb 07 00 fc 07 01 06 07 01 07 07 01 08 07 01 09 |................|
000000a0 07 01 0a 07 01 0b 07 01 0c 07 01 0d 09 00 30 00 |..............0.|
000000b0 75 09 00 30 00 76 09 00 30 00 77 09 00 30 00 78 |u..0.v..0.w..0.x|
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000000d0 00 30 00 91 09 00 30 00 98 09 00 30 00 9d 09 00 |.0....0....0....|
000000e0 31 00 77 09 00 31 00 79 09 00 33 00 80 09 00 33 |1.w..1.y..3....3|
000000f0 00 86 09 00 33 00 8d 09 00 33 00 92 09 00 33 00 |....3....3....3.|
00000100 95 0a 00 24 00 9c 0a 00 25 00 82 0a 00 25 00 8a |...$....%....%..|
00000110 0a 00 26 00 82 0a 00 27 00 6d 0a 00 27 00 71 0a |..&....'.m..'.q.|
00000120 00 27 00 72 0a 00 27 00 73 0a 00 27 00 9a 0a 00 |.'.r..'.s..'....|
00000130 28 00 7a 0a 00 29 00 6d 0a 00 2b 00 6e 0a 00 2c |(.z..).m..+.n..,|
00000140 00 97 0a 00 2d 00 87 0a 00 2d 00 93 0a 00 2e 00 |....-....-......|
00000150 88 0a 00 2f 00 7e 0a 00 30 00 6f 0a 00 30 00 74 |.../.~..0.o..0.t|
00000160 0a 00 30 00 7b 0a 00 30 00 8c 0a 00 30 00 99 0a |..0.{..0....0...|
00000170 00 31 00 6f 0a 00 31 00 96 0a 00 32 00 70 0a 00 |.1.o..1....2.p..|
00000180 33 00 7c 0a 00 33 00 7d 0a 00 33 00 83 0a 00 33 |3.|..3.}..3....3|
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000001b0 0a 00 36 00 8f 0a 00 36 00 90 0c 00 c7 00 a9 0c |..6....6........|
000001c0 00 c7 00 b0 0c 00 c7 00 b3 0c 00 c7 00 b7 0c 00 |................|
000001d0 d8 00 ac 0c 00 d8 00 b2 0c 00 d8 00 b6 0c 00 d9 |................|
000001e0 00 a5 0c 00 da 00 d0 0c 00 db 00 cf 0c 00 dc 00 |................|
000001f0 cf 0c 00 dd 00 d0 0c 00 de 00 cf 0c 00 df 00 a6 |................|
00000200 0c 00 e0 00 a5 0c 00 e1 00 a5 0c 00 e1 00 b4 0c |................|
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000002a0 0c 01 11 00 a7 0c 01 14 00 ab 0c 01 18 00 cf 01 |................|
000002b0 00 00 01 00 18 20 2f 65 74 63 2f 69 6e 69 74 2e |..... /etc/init.|
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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 filenameSpecifies 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。