src/com.enterprise_name.project_name. Main.java (the main class)

src/com.enterprise_name.project_name.model.(here all model classes)

src/com.enterprise_name.project_name.view.(here all view classes, JFrame, Jdialog,etc)

src/com.enterprise_name.project_name.view.resources.(here all the files and images used in the views *note)

src/com.enterprise_name.project_name.controller.(here all controller classes)

lib/(here all the external libraries - dont forget add to build path)

*note if you need some resource file (xml, config file, etc) create a package .resources. in the specific place where do you need (model, controller, view)

If you run javac without any arguments, help content gets printed

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

And -d says -d <directory> Specify where to place generated class files

Starting from Java 7, you can use the java.nio.file.Files & java.nio.file.Paths classes.

Path path = Paths.get("C:\\Images\\Background\\..\\Foreground\\Necklace\\..\\Earrings\\..\\Etc");

try {
    Files.createDirectories(path);
} catch (IOException e) {
    System.err.println("Cannot create directories - " + e);
}

This is a tricky solution (because I used only one path to go to the whole structure).

If you don't like tricky solutions, you can use 4 simple paths instead:

Path p1 = Paths.get("C:\\Images\\Background");
Path p2 = Paths.get("C:\\Images\\Foreground\\Necklace");
Path p3 = Paths.get("C:\\Images\\Foreground\\Earrings");
Path p4 = Paths.get("C:\\Images\\Foreground\\Etc");

and then call the createDirectories method for all of them:

Files.createDirectories(p1);
Files.createDirectories(p2);
Files.createDirectories(p3);
Files.createDirectories(p4);