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Opening files from folders in IntelliJ IDEA

I'm a beginning Java programmer and I had a project on my USB and I was trying to double click the source code just from the folder and not going into any software or IDEs.
However, it just opens the code in a Notepad and gives me an "Open with Visual Studio" option when I right click on the folder. There is no "Open with IntelliJ IDEA" option. Would be great if you guys could help me out.
I was also wondering how I could save projects in another folder or drive without having to go to the files program and copying and pasting into the drive I want it to be in.

Create a text file and add the following code in it:
#echo off
SET PhpStormPath=C:\Program Files\JetBrains\PhpStorm 2019.3.1\bin\phpstorm64.exe
echo Adding file entries
#reg add "HKEY_CLASSES_ROOT\*\shell\PhpStorm" /t REG_SZ /v "" /d "Open in PhpStorm" /f
#reg add "HKEY_CLASSES_ROOT\*\shell\PhpStorm" /t REG_EXPAND_SZ /v "Icon" /d "%PhpStormPath%,0" /f
#reg add "HKEY_CLASSES_ROOT\*\shell\PhpStorm\command" /t REG_SZ /v "" /d "%PhpStormPath% \"%%1\"" /f
echo Adding within a folder entries
#reg add "HKEY_CLASSES_ROOT\Directory\Background\shell\PhpStorm" /t REG_SZ /v "" /d "Open with PhpStorm" /f
#reg add "HKEY_CLASSES_ROOT\Directory\Background\shell\PhpStorm" /t REG_EXPAND_SZ /v "Icon" /d "%PhpStormPath%,0" /f
#reg add "HKEY_CLASSES_ROOT\Directory\Background\shell\PhpStorm\command" /t REG_SZ /v "" /d "%PhpStormPath% \"%%V\"" /f
echo Adding folder entries
#reg add "HKEY_CLASSES_ROOT\Directory\shell\PhpStorm" /t REG_SZ /v "" /d "Open with PhpStorm" /f
#reg add "HKEY_CLASSES_ROOT\Directory\shell\PhpStorm" /t REG_EXPAND_SZ /v "Icon" /d "%PhpStormPath%,0" /f
#reg add "HKEY_CLASSES_ROOT\Directory\shell\PhpStorm\command" /t REG_SZ /v "" /d "%PhpStormPath% \"%%1\"" /f
pause
Rename the file with the extension to script.cmd or script.bat
Run this file as administrator.

However, it just opens the code on a notepad and gives me an open with visual studio option when I right click on the folder. There is no "open with Intellij idea" option
Sounds like you're on Windows and missed the option during Intellij installation to associate file types to the IDE.
In windows control center, there is file associations you can edit away from notepad or you can right click, go to properties, then change the "open with" options
Regarding opening whole folders, I don't typically go through right click menus, but if you want to edit code, you'd typically open the IDE anyway, so just open it, then open the folder as a project
For copying files, I don't quite understand the problem, but it's not going to be solved by Java or Intellij, and I don't know any easier way to copy files between directories or drives

When you 1st installed IntelliJ, you must have not checked the appropriate boxes to allow you to do those actions that you wanted. Installation Options when installing IntelliJ IDEA Community Edition
Under "Update context menu" you should check the box to Add "Open Folder as Project". This will allow you to choose your directory with all your Java files.
Under "Create Associations" you should check the box for .java. This will allow to double-click on your .java file to open IntelliJ.

Press W+R then type regedit and navigate to the displayed location. If those directories are not there then you can add them and add the value of the icon according to your software location.and then add these to command

Wmic process call in for loop doesn't start the cmd

I am trying to retrieve the ProcessID of a Java app launched through a batch file. The problem is that the application does not start.
My code:
set cmd=java -jar XXXXXXX.jar XXXXXX.yml
for /f "tokens=2 delims==; " %%a in (' wmic process call create "%cmd%" ^| find "ProcessId" ') do set PID=%%a
start cmd /k echo %pid%
PAUSE

Batch files are pretty picky with whitespace.
Change this:
set cmd = java -jar XXXXXXX.jar XXXXXX.yml
To this:
set cmd=java -jar XXXXXXX.jar XXXXXX.yml
This works:
set cmd=notepad
for /f "tokens=2 delims==; " %%a in (' wmic process call create "%cmd%" ^| find "ProcessId" ') do set PID=%%a
start cmd /k echo %pid%
PAUSE
There may be something wrong with your jar file or perhaps java is not on your PATH. Try running your command directly at a command prompt to see if it works:
c:\>java -jar XXXXXXX.jar XXXXXX.yml
Also make sure that you use the full path to your jar file in your cmd otherwise the path will be relative to your system folder:
set cmd=java -jar c:\yourpath\XXXXXXX.jar XXXXXX.yml

Batch Deleting Files While Performing a Copy/Merge

I have 2 files, "launcher.jar" and "camStudio.jar" that I need merged. I decided to try to do this using batch with the code:
copy /b launcher.jar + camStudio.jar file.jar
However, the resulting "file.jar" only contains the contents of "camStudio.jar". How can I prevent the files in "launcher.jar" from being deleted?

Combining the contents of two .jar files is a little more complicated than just calling copy from the command line. Rather than a normal directory, .jar files are a type of compressed file, so you need special utilities to manipulate them. Fortunately these tools come with the standard JKD.
The JDK comes with the utility jar that is unsurprisingly used for manipulating .jar files. It's usage is described as this:
Usage: jar {ctxui}[vfmn0Me] [jar-file] [manifest-file] [entry-point] [-C dir] files ...
Options:
-c create new archive
-t list table of contents for archive
-x extract named (or all) files from archive
-u update existing archive
-v generate verbose output on standard output
-f specify archive file name
-m include manifest information from specified manifest file
-n perform Pack200 normalization after creating a new archive
-e specify application entry point for stand-alone application
bundled into an executable jar file
-0 store only; use no ZIP compression
-M do not create a manifest file for the entries
-i generate index information for the specified jar files
-C change to the specified directory and include the following file
If any file is a directory then it is processed recursively.
The manifest file name, the archive file name and the entry point name are
specified in the same order as the 'm', 'f' and 'e' flags.
Example 1: to archive two class files into an archive called classes.jar:
jar cvf classes.jar Foo.class Bar.class
Example 2: use an existing manifest file 'mymanifest' and archive all the
files in the foo/ directory into 'classes.jar':
jar cvfm classes.jar mymanifest -C foo/ .
Relevant commands for combining two .jar files are x and c. Even with this, combining the .jar files takes more than a line or two, so I put together this .bat files to automate it.
:: Pass one or more .jar files as command line arguments
:: Combine_Jar [file1] [file2 ...]
:: Combine_Jar Test.jar
:: Combine_Jar Test.jar Test2.jar Test3.jar
#echo off & setlocal enabledelayedexpansion
set "jarDir=%cd%"
set "newJar="
set "folders="
pushd %temp%
for %%a in (%*) do (
call :extract %%a
set "newJar=!newJar!_%%~na_"
)
set "tempDirs=!newJar:_=^"!"
set "tempDirs=%tempDirs:^"^"=^" ^"%"
set "newJar=!newJar:~1,-1!.jar"
set "newJar=!newJar:__=_!"
if exist "!newJar!" del /Q "!newJar!"
jar cf "!newJar!" %tempDirs%
for %%a in (%*) do call rd /s /q "%%~na"
move /Y "!newJar!" "%jarDir%" > nul
popd
exit /B
:extract
set "tempDir=%~n1"
if exist "%tempDir%" (
rd /s /q "%tempDir%"
)
md "%tempDir%"
pushd "%tempDir%"
jar xf "%jarDir%\%~1"
popd
exit /B
It will all jar files passed as arguments into a single jar files.

Pipe multiple outputs of Java programs to multiple files

I have a set of files, labeled file1.java, file2.java, ...
I want to pipe the output of the files to .txt files, such as output1.txt, output2.txt, etc. corresponding to each java file.
I know that I can do this by doing:
javac file1.java
java file1 > output1.txt
However, is there a way to do this of all files in a given directory? (instead of doing it manually)

This is a good for loop example:
Command line usage:
for /f %f in ('dir /b c:\') do echo %f
Batch file usage:
for /f %%f in ('dir /b c:\') do echo %%f
if the directory contains files with space in the names, you need to change the delimiter the for /f command is using. for example, you can use the pipe char.
for /f "delims=|" %%f in ('dir /b c:\') do echo %%f
If the directory name itself has a space in the name, you can use the usebackq option on the for:
for /f "usebackq delims=|" %%f in (`dir /b "c:\program files"`) do echo %%f
And if you need to use output redirection or command piping, use the escape char (^):
for /f "usebackq delims=|" %%f in (dir /b "c:\program files" ^|
findstr /i microsoft) do echo %%f
It shows both command line + batch for loop examples. Then you will have the filenames and can just run some commands on those filenames like javac and java.
Just try to break it down to small tasks:
Get list of files (all or just .class)
Loop through each file and call javac and java on them
Google is your best friend - search for "DOS batch" + what you need

Your job is much easier if you restructure your output file names a bit: file1.java --> file1_output.txt
From the command line:
for %F in (*.java) do #javac "%F" >"%~nF_output.txt"
If in a batch file:
#echo off
for %%F in (*.java) do javac "%%F" >"%%~nF_output.txt"
If you keep your original naming convention, then you must parse out the number form each file name. Very doable, but it doesn't seem worthwhile in your case.

Executable jar

Alright i made a executable jar that holds a test game ran through a application. It runs fine for me but for my friend it does not. It says its unable to find the main class. So does he have to install java jdk or something? Is there a way around this?

Well, for one, he could be using the wrong command line arguments to the JVM to run the Java jar. Secondly, you could have not defined the main class correctly when you built the jar file (see: Unable to load main-class for jar file).
The way that you work around this? In the link I provided above, you'll see that there are a few command line parameters that can be supplied to the JVM that makes a big difference in how the JVM runs. Take those command line parameters and build a batch (or shell) file that end users can run to initialize the program correctly.
As your computer is setup differently, so may be the shell extension that handles files of type ".jar"

Try installing the newest version of java (JRE) on their machine (make sure it is of equal or higher version than the one your application was compiled against) and ensure that if you are using different architectures (x86 / x64) that you have the right versions of any libraries. I had this error only yesterday because I deployed a JDK 7u7 application to a machine with JRE 6u7.

Yes, there is a way around it. Run this script:
#ECHO off
SETLOCAL ENABLEDELAYEDEXPANSION
:: this .bat script creates a file association for executable .jar files
ECHO Creating .jar file association...
ECHO JAVA_HOME is %JAVA_HOME%
IF NOT DEFINED JAVA_HOME GOTO :FAIL
REG ADD "HKCR\jarfile" /ve /t REG_SZ /d "Executable Jar File" /f
REG ADD "HKCR\jarfile\shell" /ve /f
REG ADD "HKCR\jarfile\shell\open" /ve /f
ECHO REG ADD "HKCR\jarfile\shell\open\command" /ve /t REG_SZ /d "\"%JAVA_HOME%\bin\javaw.exe\" -jar \"%%1\" %%*" /f
REG ADD "HKCR\jarfile\shell\open\command" /ve /t REG_SZ /d "\"%JAVA_HOME%\bin\javaw.exe\" -jar \"%%1\" %%**" /f
REG ADD "HKLM\jarfile" /ve /t REG_SZ /d "Executable Jar File" /f
REG ADD "HKLM\SOFTWARE\Classes\jarfile\shell" /ve /f
REG ADD "HKLM\SOFTWARE\Classes\jarfile\shell\open" /ve /f
REG ADD "HKLM\SOFTWARE\Classes\jarfile\shell\open\command" /ve /t REG_SZ /d "\"%JAVA_HOME%\bin\javaw.exe\" -jar \"%%1\" %%*" /f
ECHO Finished creating .jar file association for executable .jar files.
PAUSE
GOTO EOF
:FAIL
ECHO Script failed. JAVA_HOME not defined.
PAUSE

install the new JRE .
while running the jar make sure you giv the class path in he command.
Eg. java -cp asd -jar file.jar