[Simple Java] Access Control and simple permission Control for Java members

[Simple Java] Access Control and simple permission Control for Java members

Access Control in Java includes two parts:

• Class access permission Control
• Access permission Control for Class Members

For a class, the access permission control modifier can be public or non-modifier (default package access permission );

For Class Members, the access permission control modifier can be public, protected, package private (without modifier), or private.

The following table summarizes the access levels corresponding to different access control modifiers of class members:

Note:

SubClass here refers to sub-classes of different packages

World refers to different non-subclass packages.

Http://www.programcreek.com/2011/11/java-access-level-public-protected-private/.