To launch the Java program, launch the CMD and type the commands. Java extensions can be used to create complex programs. Then save the Java program by entering the class name followed by the class name. External process execution can be handled effectively with Apache’s common-exec library. If you don’t want to use a third-party lib, keep track of notepad.exe (or it’s in the PATH). The code below is used to open a file in a native library such as SWT. The practice of double-clicking on a text in Windows can be performed with a plain JRE. Furthermore, an extra parameter called exec, which serves as the operating system’s working directory, can be added to make it easier to launch a file that contains the contents of your application’s storage. The Notepad file will open with the file test.txt, which can be edited. As an example, I use C:/Windows/otepad for my Notepad on my computer. To start the Windows program notepad.exe, navigate to the exec directory. In the File Open dialog, select the java file you want to open.

To open a java file in notepad++, first open notepad++.

Online notepad++ compiler