Method 1:

Go to d:/web/wsh: javac a.java.

Then exit the wsh directory and enter javac wsh/b.java under d:/wsh to compile successfully!

Method 2: By using the javac -classpath(cp) parameter.

Go to d:/web/wsh: javac a.java.

Or under d:/wsh/wsh: javac-classpath d:/web/wsh b.java.

This can also be compiled successfully!

The following methods all passed the test!

The following parameters are compiled by javac:

Usage: javac & lt source file >

Options:

-g:none does not generate any debugging information.

-g:{lines, vars, source} only generates some debugging information.

-nowarn does not generate any warnings.

-verbose outputs a message about what the compiler is doing.

-deprecation output uses the source location of the expired API.

-class path & lt； Path > specifies the location to find user class files.

-CP & lt； Path > specifies the location to find user class files.

-source path & lt； Path > specifies where to find the input source file.

-boot class path & lt； Path > overwrites the location of the boot class file.

-ext dirs & lt； Directory > the location of the extended directory in cover the installation.

-Endorser < Directory > the location of the standard path that overrides the signature.

-d & lt； Directory > specifies the location where the generated class files are stored.

-encoding < code > specifies the character encoding used by the source file.

-source & lt； Version > provides source code compatibility with the specified version.

-target & lt； Version > generates a class file for a specific virtual machine version.

-Version version information

-help outputs a summary of standard options.

-X outputs a summary of non-standard options.

-J & lt； Logo > Pass pass directly to the runtime system.