protected

package oo.day05.vis;
import oo.day05.Aoo;


public class Coo { //演示同包
void show(){
Aoo o = new Aoo();
o.a = 1;
//o.b = 2;
//o.c = 3;
//o.d = 4;
}
}


class Doo extends Aoo{ //演示protected
void show(){
a = 1;
b = 2;
//c = 3;
//d = 4;
}
}