吃透Java基础一：Java访问权限修饰符

	同类	同包	同包子类	不同包子类	不同包
public	√	√	√	√	√
protected	√	√	√	√
包访问权限	√	√	√
private	√

下面看例子：
base包下定义Father类，四种权限定义方法

package base;
public class Father {
    public void showPublic() {

    }

    protected void showProtected() {

    }

    void showFriendly() {

    }

    private void showPrivate() {

    }
}

同包子类

package base;

public class Son extends Father {

    public static void main(String[] args) {
        Son son = new Son();
        son.showPublic();
        son.showProtected();
        son.showFriendly();
//        son.showPrivate();报错
    }
}

同包其它类

package base;
public class Other {
    public static void main(String[] args) {
        Father father = new Father();
        father.showPublic();
        father.showProtected();
        father.showFriendly();
//        father.showPrivate();报错
    }
}

不同包子类

package text;

import base.Father;

public class AnotherSon extends Father {
    public static void main(String[] args) {
        AnotherSon anotherSon = new AnotherSon();
        anotherSon.showPublic();
        anotherSon.showProtected();
//        anotherSon.showFriendly();报错
//        anotherSon.showPrivate();报错
    }
}

不同包其它类

package text;

import base.Father;

public class Another {
    public static void main(String[] args) {
        Father father = new Father();
        father.showPublic();
//        father.showProtected();报错
//        father.showFriendly();报错
//        father.showPrivate();报错
    }
}