Original.java

package p1;

public class Original{
    int n_friendly = 1;
    private int n_private = 2;
    protected int n_protected = 3;
    public int n_public = 4;
    void Access(){
        System.out.println("****In same class, you can access ...");
        System.out.println("friendly member "+n_friendly);
        System.out.println("private member "+n_private);
        System.out.println("protected member"+n_protected);
        System.out.println("public member "+n_public);
    }
}

class Derived extends Original{
    void Access(){
        System.out.println("**** 相同包的子类 ****");
        System.out.println("friendly member"+n_friendly);
        //System.out.println("private member "+n_private);
        //不能访问
        System.out.println("protected member"+n_protected);
        System.out.println("public member "+n_public);

        Original o = new Original();
        System.out.println("**** 相同包的子类的其他对象 ****");
        System.out.println("friendly member"+o.n_friendly);
        //System.out.println("private member "+o.n_private);
        //不能访问
        System.out.println("protected member"+o.n_protected);
        System.out.println("public member "+o.n_public);
    }
}

class SamePackageClass{
     void Access(){
         Original o = new Original();
        System.out.println("**** 相同包的其他类 ****");
        System.out.println("friendly member "+o.n_friendly);
         //System.out.println("private member "+0.n_private);
        //不能访问
        System.out.println("protected member"+o.n_protected);
        System.out.println("public member "+o.n_public);
    }
}

class AccessControl{
    public static void main(String args[]){
        Original o = new Original();
        o.Access();
        Derived d  = new Derived();
        d.Access();
        SamePackageClass s = new SamePackageClass();
        s.Access();
    }
}