从Jar重新编译一个Java类 [英] Re-compile a Java Class from Jar

问题描述

我有一个可执行的jar有一个类文件的值错误。我请求作者的文件，并更正了值。

现在我想编译它，并将编译的类文件添加到jar并运行它。

毫不奇怪，我在jar文件中的自定义对象的引用获取了多个无法找到符号错误。

我试图通过引用类路径中的jar文件来编译文件，如

 
 C：/> javac file.java -classpath C：/ folder / where / jar / is 
 

工作...我得到相同的错误，如果只是做

 
 C：/> javac file.java 
 

有没有办法编译这个单独的类引用jar中的其他文件？

谢谢。

---

错误我得到了以下的一些建议：

 
 javac -classpath C：/jar/location.jar File.java 
 
 File.java:226：找不到符号
 symbol：class Stuff 
 location：class com.shared.stuffers 
 Stuff s1 = new Stuff（）; 
 ^ 
 

在Jar中找到Stuff类，但javac程序无法看到...我感觉我做错了，但不知道在哪里？

解决方案

您将需要编译您的文件：

  javac -classpath C：\folder\where\jar\is\the_jar_file.jar file.java 
   
 
 
 
  C：\Console2> ; javac -help 
用法：javac< options> <源文件> 
  
 
I have an executable jar that has one class file with a wrong value. I requested that file from the author and corrected the value. 

Now I want to compile it and add the compiled class file into the jar and run it. 

Not surprisingly I get multiple "cannot find symbol" errors for references of custom object that were in the jar file. 

I tried to compile the file by referencing the jar file in the classpath like so
C:/> javac  file.java  -classpath C:/folder/where/jar/is
but this doesnt seem to work... I get the same errors as if just doing
C:/> javac file.java
Is there a way to compile this individual class somehow referencing the other files in the jar?

Thanks.



Errors I am getting while following some of the suggestions below here:
javac -classpath C:/jar/location.jar File.java

File.java:226: cannot find symbol
symbol  : class Stuff
location: class com.shared.stuffers
                              Stuff s1 = new Stuff();
                                             ^
Stuff class is found in the Jar, but can not be seen by the javac program... I feel like I am doing something wrong but not sure where? Thanks.
解决方案
You will want to compile your file like so:
javac -classpath C:\folder\where\jar\is\the_jar_file.jar file.java
per the javac usage instructions:
C:\Console2>javac -help
Usage: javac <options> <source files>


                        
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