In order to better organize classes, Java provides a package mechanism to distinguish the namespace of class names. (Recommended: java video tutorial)
Function of packages
1. Organize classes or interfaces with similar or related functions into the same package for convenience Find and use classes.
2. Like folders, packages also use a tree directory storage method. The names of classes in the same package are different, and the names of classes in different packages can be the same. When classes with the same class name in two different packages are called at the same time, the package name should be added to distinguish them. Therefore, packages can avoid name conflicts.
3. Packages also limit access permissions. Only classes with package access permissions can access classes in a certain package.
Java uses the package mechanism to prevent naming conflicts, access control, provide search and location of classes, interfaces, enumerations and annotations, etc.
The syntax format of the package statement is:
package pkg1[．pkg2[．pkg3…]];
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