Question

我正在使用以下命令编译Java程序：

javac -cp ./classes/ src/com/oracle/tutorial/jdbc/JDBCTutorialUtilities.java

但具有讽刺意味的是，生成的类文件是在不在类路径中的同一源文件夹中创建的。所以每次编译后我都要移动类文件。是的，我已在源中正确指定了包。如何解决？

Answer 1

你应该使用

javac -d ./classes/ src/com/oracle/tutorial/jdbc/JDBCTutorialUtilities.java

-cp选项用于设置类路径，而不是用于指定输出目录。

adarsh$ javac -help
Usage: javac <options> <source files>
where possible options include:
  -g                         Generate all debugging info
  -g:none                    Generate no debugging info
  -g:{lines,vars,source}     Generate only some debugging info
  -nowarn                    Generate no warnings
  -verbose                   Output messages about what the compiler is doing
  -deprecation               Output source locations where deprecated APIs are used
  -classpath <path>          Specify where to find user class files and annotation processors
  -cp <path>                 Specify where to find user class files and annotation processors
  -sourcepath <path>         Specify where to find input source files
  -bootclasspath <path>      Override location of bootstrap class files
  -extdirs <dirs>            Override location of installed extensions
  -endorseddirs <dirs>       Override location of endorsed standards path
  -proc:{none,only}          Control whether annotation processing and/or compilation is done.
  -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process
  -processorpath <path>      Specify where to find annotation processors
  -d <directory>             Specify where to place generated class files
  -s <directory>             Specify where to place generated source files
  -implicit:{none,class}     Specify whether or not to generate class files for implicitly referenced files
  -encoding <encoding>       Specify character encoding used by source files
  -source <release>          Provide source compatibility with specified release
  -target <release>          Generate class files for specific VM version
  -version                   Version information
  -help                      Print a synopsis of standard options
  -Akey[=value]              Options to pass to annotation processors
  -X                         Print a synopsis of nonstandard options
  -J<flag>                   Pass <flag> directly to the runtime system
  -Werror                    Terminate compilation if warnings occur
  @<filename>                Read options and filenames from file

Answer 2

您可以使用-d参数指定javac的输出文件夹。

检查here for more details

Answer 3

您将 -d 作为javac命令的选项

-d 目录设置类文件的目标目录。目标目录必须已存在; javac不会创建目标目录。

If **-d** is not specified, javac puts the class file in the same directory as the source file.

请注意， -d 指定的目录不会自动添加到您的用户类路径

未在classes文件夹中创建Java类文件

3 个答案: