Packages

 

Class member access

package main.p1;

public class Protection {
    int n = 1;
    private int n_pri = 2;
    protected int n_pro = 3;
    public int n_pub = 4;

    public Protection() {
        System.out.println("base constructor");
        System.out.println("n = " + n);
        System.out.println("n_pri = " + n_pri);
        System.out.println("n_pro = " + n_pro);
        System.out.println("n_pub = " + n_pub);
    }
}

package main.p1;

public class Derived extends Protection {

    Derived() {
        System.out.println("derived constructor");
        System.out.println("n = " + n);
        // class only
// System.out.println("n_pri = "4 + n_pri);
        System.out.println("n_pro = " + n_pro);
        System.out.println("n_put = " + n_pub);
    }
}
package main.p1;

public class SamePackage {
    SamePackage() {
        Protection p = new Protection();
        System.out.println("same package constructor");
        System.out.println("n = " + p.n);

        // class only
//        System.out.println("n_pri = " + p.n_pri);
        System.out.println("n_pro = " + p.n_pro);
        System.out.println("n_pub = " + p.n_pub);
    }
}
package main.p2;

import main.p1.Protection;

public class Protection2 extends Protection {

    Protection2() {
        System.out.println("derived other package constructor");
        // class or package only
//        System.out.println("n = " + n);
        // class only
//        System.out.println("n_pri = " + n_pri);
        System.out.println("n_pro = " + n_pro);
        System.out.println("n_pub = " + n_pub);
    }
}
package main.p2;

import main.p1.Protection;

public class OtherPackage {

    OtherPackage() {
        Protection p = new Protection();
        System.out.println("other package constructor");

//        class or package only
//        System.out.println("n = " + p.n);
        // class only
//        System.out.println("n_pri = " + p.n_pri);
        // class, subclass or package only
//        System.out.println("n_pro = " + p.n_pro);
        System.out.println("n_pub = " + p.n_pub);
    }
}