java无法重新编译反编译的类文件

Question

我有一点Java我想编辑（这是一个Minecraft mod），我反编译了。类文件（使用JDGUI），编辑了我想要的内容，然后尝试重新编译（使用javac）

我犯了几百个错误。不过我只编辑了几行，所以我试着编译。未经编辑的java，与反编译器中的完全相同。同样的事情，成百上千的错误

对Java知之甚少，所以我肯定我犯了一些错误。为什么它不能编译未从有效工作区编辑的代码。班级档案

以下是我得到的示例：

ReiMinimap.java:451: illegal start of expression
              switch (???)
              ^
ReiMinimap.java:451: ';' expected
              switch (???)
                    ^
ReiMinimap.java:451: illegal start of expression
              switch (???)
                      ^
ReiMinimap.java:451: illegal start of expression
              switch (???)
                        ^
ReiMinimap.java:451: illegal start of expression
              switch (???)
                         ^
ReiMinimap.java:452: illegal start of expression
              {
              ^
ReiMinimap.java:452: : expected
              {
               ^
ReiMinimap.java:453: ';' expected
              case 49:
                     ^
ReiMinimap.java:453: ')' expected
              case 49:
                      ^
ReiMinimap.java:454: illegal start of expression
                this.allowCavemap = true;
                    ^
ReiMinimap.java:454: ';' expected
                this.allowCavemap = true;
                     ^
ReiMinimap.java:454: illegal start of expression
                this.allowCavemap = true;
                                  ^
ReiMinimap.java:454: ';' expected
                this.allowCavemap = true;
                                   ^
ReiMinimap.java:456: orphaned case
              case 50:
              ^
ReiMinimap.java:308: 'try' without 'catch' or 'finally'
    try { if (paramMinecraft == null);
    ^
ReiMinimap.java:499: illegal start of type
      else
      ^
ReiMinimap.java:499: ';' expected
      else
          ^
ReiMinimap.java:501: illegal start of type
        this.chatWelcomed = true;
        ^
ReiMinimap.java:501: <identifier> expected
        this.chatWelcomed = true;
            ^
ReiMinimap.java:501: ';' expected
        this.chatWelcomed = true;
             ^
ReiMinimap.java:501: illegal start of type
        this.chatWelcomed = true;
                          ^
ReiMinimap.java:501: <identifier> expected
        this.chatWelcomed = true;
                           ^

还有一些代码：

if ((!this.chatWelcomed) && (System.currentTimeMillis() < this.chatTime + 10000L))
      {
        Object localObject1;
        for (localObject2 = this.chatLineList.iterator(); ((Iterator)localObject2).hasNext(); ) { localObject1 = (ahe)((Iterator)localObject2).next();

          if ((localObject1 == null) || (this.chatLineLast == localObject1)) break;
          Matcher localMatcher1 = Pattern.compile("§0§0((?:§[1-9a-d])+)§e§f").matcher(((ahe)localObject1).a);
          while (localMatcher1.find())
          {
            this.chatWelcomed = true;
            for (??? : localMatcher1.group(1).toCharArray())
            {
              switch (???)
              {
              case 49:
                this.allowCavemap = true;
                break;
              case 50:
                this.allowEntityPlayer = true;
                break;
              case 51:
                this.allowEntityAnimal = true;
                break;
              case 52:
                this.allowEntityMob = true;
                break;
              case 53:
                this.allowEntitySlime = true;
                break;
              case 54:
                this.allowEntitySquid = true;
                break;
              case 55:
                this.allowEntityLiving = true;
              }
            }
          }

Answer 1

听起来像是原始Java编译被混淆了。模糊处理者使用了许多技巧，使代码的逆向工程变得困难。例如，在中包含方法和字段名是合法的。类文件，这些文件在Java源代码（for，if，等等）中是保留字。如果混淆器使用了这些技巧，那么当您反编译。类文件，Java源代码是非法的，因为不能将这些保留字用作方法或字段名