(1) We create a folder called nmr-applet in our hard disk C.

(2) In the nmr-applet folder, we create another folder called OneXtal. The MANIFEST.MF and OneXtalJDK118.jar files (see Step 3) that support the applet will be saved in the OneXtal folder.

(3) In the OneXtal folder, we create the ppmrmn folder, whose name must not be changed, because ppmrmn is involved in the Java files as a package.

The ppmrmn folder will store the files about Java source codes as xxx.java (see Step 2). After compiling these files with JDK10, the corresponding class files will also be stored in this folder as xxx.class (see Step 3).