Naming conventions and import use of the package in basic Java

The name of the package is generally used in the company domain name but note that the domain name suffix should be preceded as follows

 Package Com.cnblogs.i.cat// corresponding address is com/cnblos/i/cat.class, which is Cat.class address.

If you want to put a class into a package, in this class source file the first sentence

You must ensure that the class file is in the correct directory

Another class to access: Write full name introduces access to classes in the same package does not need to be introduced

Import com.cnblogs.i.cat// Introduction mode new com.cnblogs.i.cat (); // Full Name Method New Cat (); // under the same package

It is also important to note that the directory of the top-level package of the class file is located under Classpath

Naming conventions and import use of the package in basic Java