Các mức truy cập trong java

Access Modifiers-------Same Class-------Same Package-----Subclass-----Other packages
public----------------------Y-------------------Y-------------------Y-------------------Y
protected------------------Y-------------------Y-------------------Y-------------------N
no access modifier-------Y------------------- Y------------------- N------------------- N
private---------------------Y-------------------N-------------------N------------------- N


See more: http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html