JavaSE-10.4.2【权限修饰符】

package day1.yppah04.p3;

/*
4.3 权限修饰符

修饰符     同一类     同一包中子类/无关类      不同包的子类      不同包的无关类
private     OK
默认        OK              OK
protected   OK              OK                     OK
public      OK              OK                     OK              OK
 */

public class Fu {

    private void show1(){
        System.out.println("private");
    }

    void show2(){
        System.out.println("默认");
    }

    protected void show3(){
        System.out.println("protected");
    }

    public void show4(){
        System.out.println("public");
    }

    public static void main(String[] args) {
        Fu f = new Fu();
        f.show1();
        f.show2();
        f.show3();
        f.show4();
    }

}

package day1.yppah04.p3;

public class Zi extends Fu{

    public static void main(String[] args) {
        Zi z = new Zi();
        z.show2();
        z.show3();
        z.show4();
        //z不可访问show1()
    }

}

package day1.yppah04.p3;

public class Demo {

    public static void main(String[] args) {
        Fu f = new Fu();
        f.show2();
        f.show3();
        f.show4();
        //f不可访问show1()
    }

}

package day1.yppah04.p4;

import day1.yppah04.p3.Fu;

public class Zi extends Fu {

    public static void main(String[] args) {
        Zi z = new Zi();
        z.show3();
        z.show4();
        //z不可访问show1()show2()
    }

}

package day1.yppah04.p4;

import day1.yppah04.p3.Fu;

public class Demo {
    public static void main(String[] args) {
        Fu f = new Fu();
        f.show4();
        //f不可访问show1()show2()show3()
    }
}