Sorce code namespacing/dependancy specification. Does it exist in java?

Question

I'm just curious if you can specify the sourcepaths in the code like you can in c++. In java, it seems like everything is dependent on environment variables or compiler setttings and all kinds of other fun volitile stuff. Is there a way of specifying all your dependancies in the source code, so you don't have to worry about cross-compiler issues (other than version problems, of course)?

Answer 1

Ops, looks like i struck a nerve. Sorry to be so
blunt, but whenever I check google for tutorials on
compiler commands and configuration, all that comes
up is installation helpers and definitions on what a
classpath is. There's also environment variable
tutorials, which don't help me either. There was even
a tutorial on making a bash script for environment
details.It's just a different model.
"Yes, you specify the classpath."
Is that the javac -classpath option?Yes, that's the generally preferred way. You can also use a CLASSPATH env var.
Can you point me
to a place that describes how it works and all ths
ins and outs?
Javapedia: Classpath
How Classes are Found
Setting the class path (Windows)
Setting the class path (Solaris/Linux)
Understanding the Java ClassLoader
java -cp .;<any other directories or jars> YourClassNameYou get a NoClassDefFoundError message because the JVM (Java Virtual Machine) can't find your class. The way to remedy this is to ensure that your class is included in the classpath. The example assumes that you are in the same directory as the class you're trying to run.
javac -classpath .;<any additional jar files or directories> YourClassName.javaYou get a "cannot resolve symbol" message because the compiler can't find your class. The way to remedy this is to ensure that your class is included in the classpath. The example assumes that you are in the same directory as the class you're trying to run.
variations with no avail. Nothing seems to give a
straight answer on how to build a classpath if you
just have the program source files."if you just have the source files"?
So if your A.java depends on class B, and you only have B.java, you want to compile B.java and tell it where to find the resulting B.class, right?
If that's the case,then, yeah, go with ant or maven. You can do it with javac, but it gets hairy if you have multiple source trees.
On the other hand, if you're just compiling everything under one root, you can do something like this. Not sure of the details as it's been a wihle since I've done a direct javac on anything other than pwd.
(Assumes a n*x system.)
javac -d some_output_dir- classpath some_output_dir $(find com -name \*.java)Although whatever -d points to might implicitly be on the classpath anyway.
It's hard to provide specific help as it's not clear what your specific problem is. You seem to be speaking in terms that apply to the C model but dont apply or don't have a direct analog inthe Java model.
"No, ant invokes javac."
Can you elaborate? Even if only just a link?http://ant.apache.org/
The ant executable reads an xml file that tells it, among other things, which classes to compile, where to put the output, what jars or directories to include on the classpath during compile, and which executable to run as the compiler (usually javac).