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一、概述
访问等级比较:public > protected > default > private
无论是方法还是成员变量,这四种访问权限修饰符作用都一样
二、示例代码
test包内的父类permission
public class permission { private int privatevalue = 1; public int publicvalue = 1; protected int protectedvalue = 1; int defaultvalue = 1; void defaultfunc(){ system.out.println("this is a default function"); } public void publicfunc(){ system.out.println("this is a public function"); } protected void protectedfunc() { system.out.println("this is a protected function"); } private void privatefunc(){ system.out.println("this is a private function"); } }
test包内的子类subpermission
public class subpermission extends permission{ public void permissiontest(){ // public, protected, default function and variable can be used system.out.println("this is a default value:" + this.defaultvalue); system.out.println("this is a public value:" + this.publicvalue); system.out.println("this is a protected value:" + this.protectedvalue); this.publicfunc(); this.protectedfunc(); this.defaultfunc(); } }
test包外的子类
import base.test.permission; public class demo extends permission { public static void main(string[] args) { // if is not a subclass, only public function and variable can be used permission obj = new permission(); obj.publicfunc(); system.out.println("this is a public value:" + obj.publicvalue); // if is a subclass, public and protected function and variable can ba used demo demo = new demo(); demo.publicfunc(); demo.protectedfunc(); system.out.println("this is a public value:" + demo.publicvalue); system.out.println("this is a protected value:" + demo.protectedvalue); } }
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