How to understand the concept of packages in Java

What is a package?

In order to better organize classes, Java provides a package mechanism. Packages are containers of classes that separate class namespaces. If no package name is specified, all examples belong to a default unnamed package. Packages in Java generally contain related classes. For example, all classes related to transportation can be placed in a package named Transportation.

What is the purpose of the package?

As mentioned above, better organize classes to prevent duplicate class names in one space;

Indicates the hierarchical relationship between classes.

How to create a package?

If you don’t use IDE tools, creating a package is to create a folder. After creating a new class, just add the package name at the beginning of the class;

If you use IDE tools, it will be more convenient new Package, just specify the package name.

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