Java will not compile properly from the command line "cannot find my source files"

I am trying to compile my source code from the Windows 7 command prompt. I have added the directory in which my *.java file is located to the classpath. Yet, I still get this error:

C:\Users\Alex>javac HelloThere.java
javac: file not found: HelloThere.java
Usage: javac <options> <source files>
use -help for a list of possible options

I'm very confused as to why this happens because if I navigate to the folder where this file is located, it will compile. However, this is not a satisfactory solution since I intend on compiling JUnit tests directly from the command line as well.

Other solutions I have attempted:

C:\Users\Alex>javac -classpath "C开发者_JS百科:\Users\Alex\AndroidProject\UnitTest\src" HelloThere.java
javac: file not found: HelloThere.java
Usage: javac <options> <source files>
use -help for a list of possible options

I do not think this has ANYTHING to do with typos.

Why can't I compile my project like this?

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The CLASSPATH variable is not used by javac to find where your source code lives. Use the -sourcepath arg to javac instead.

Save yourself a lot of time and manual typing and use a build tool like Apache Ant or Maven.

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You don't want to use classpath, that tells the compiler where to find externally referenced .class files used by your file. You want to use -sourcepath which tells javac where your .java files may be hiding.