Java Code Encapsulation and compilation

Code encapsulation:

Calling another class within this Java program

Enclose the two functions in Arraytool.

Compile Order:

Compile Arraytool before compiling Arrayoperatordemo

Because the Arrayoperatordemo file will be compiled syntax check, check to the Nineth line, will be under Classpath to find out if there is Arraytool.class file, if not configured classpath will be found in the current file directory

Whether the class exists. If none of the two are available, the virtual machine will go down both paths to find out if there are any original files with the same name. That is. java file

Java Code Encapsulation and compilation