Windows 10: Java / Jar files / "open with"

Every time I try to open a jar file it opens java and then later says java cannot install because of the program I am trying to delete. When I try to delete java "jre-8u341-windows-x64" it says the program is open in "jre-8u341-windows-x64" and does not allow me to delete it. I cannot find a way to stop the programs from opening java. When I try to change the app it opens with I cannot seem to find an option to open it alone. Also, if it helps to know, I am trying to get optfine or labymod for Minecraft on my computer windows 10, but cannot open either program because of this problem. If you

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.java to .jar file

As a side note to Easy Rhinos comment, you can only jar .class files, meaning that you need to compile all the .java files and them jar the .class files resulting from the compilation. Example:
Code: javac Test.java jar cf Teste.jar Test.class[/quote]

 

.java to .jar file

if you know the manual then you know you dont put the code in the program, you convert all of your java class files into a jar file using their compiler.

 

jar files

Fixing .jar file opening on Windows requires two steps:

• Open the Control Panel, and chose "Default Programs - Associate a File type or protocol with a program". Find .jar extension (Executable JAR file) there, and pick Java as default program to open this extension. It will probably be listed as "Java Platform(SE)".
  A faster alternative perhaps is straightforward right-click on a .jar file, and then change associated program by clicking on the "Change..." button.
• Now open the regedit, and open the HKEY_CLASSES_ROOT\jarfile\shell\open\command key. Luckilly for us, we may specify parameters there for the (Default) value. This is normally: C:\Program Files\Java\jre7\bin\javaw.exe" -jar "%1" %*

I Hope this Answers your Question!