Detailed access control permissions

package com;
/*
About access control modifiers: modified classes, modified methods, modified variables
private can only be accessed in this class
public can be accessed anywhere protected Most are protected for subclasses of this class, the same package Under different packages, subclasses under different packages can default to this class, under the same package, different packages cannot, and subclasses under different packages cannot */ public class user{ protected String name;//protected to modify int age; //default } class fuck9{ public static void main(String[] args){ user u=new user(); System.out.println(u.name); System.out.println(u.age) ; } 

}

package bjpowernode;


import com.user;


public class fuck10{public static void main(String[] args){user u=new user();}}class myUser extends user{public void m1(){System.out.println(this.name);System.out.println(this.age);}}