Java 将源文件编译到不同的目录？
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Compile source file to a different directory?
提问by Jonathan Lam
Is there a way to compile a Java source file (*.java) to a different directory?
有没有办法将 Java 源文件 ( *.java)编译到不同的目录？
If my package file structure is like so:
如果我的包文件结构是这样的：
Mathematics ->
Formulas ->
src ->
// source files containing mathematical formulas...
bin ->
// class files containing mathematical formulas...
Problems ->
src ->
// source files containing mathematical problems...
bin ->
// class files containing mathematical problems...
I want to separate source and class files to keep the folders organized, but I currently have to copy all the class files from the srcfolders to the binfolders after every compile.
我想将源文件和类文件分开以保持文件夹井井有条，但我目前必须在每次编译后将所有类文件从src文件夹复制到bin文件夹中。
Is there a way to simplify this process by compiling the class files to another folder in the javaccommand?
有没有办法通过将类文件编译到javac命令中的另一个文件夹来简化这个过程？
采纳答案by Jon Skeet
Yup, absolutely - use the -doption to specify the output directory:
是的，绝对 - 使用-d选项指定输出目录：
javac -d bin src/foo/bar/*.java
Note that the directory you specify is the rootof the output structure; the relevant subdirectories will be created automatically to correspond to the package structure of your code.
请注意，您指定的目录是输出结构的根；相关的子目录将自动创建以对应于您的代码的包结构。
See the javac documentationfor more details.
有关更多详细信息，请参阅javac 文档。
In this case you'd need to issue one javaccommand to compile the formulae, and another to compile the problems though - potentially using the formulae bindirectory as part of the classpath when compiling the problems.
在这种情况下，您需要发出一个javac命令来编译公式，而另一个命令来编译问题 - 在编译问题时可能使用公式bin目录作为类路径的一部分。
(You might want to consider using a single source structure but different packages, mind you. You should also consider using an IDE to hide some of this complexity from you - it ends up getting tiresome doing all of this by hand, even though it's not actually hard.)
（您可能需要考虑使用单一源代码结构但使用不同的包，请注意。您还应该考虑使用 IDE 来向您隐藏一些这种复杂性 - 手工完成所有这些最终会变得很烦人，即使它不是其实很难。）
