The protected keyword in Java is an access modifier used for member variables and methods. It provides a level of access control that allows access within the same package and by subclasses, even if they are in different packages. Usage The protected access modifier is used to restrict access ...
(2)(4),其中的clone()方法的可见性是java.lang包及其所有子类,对于语句"son1.clone();"和"son11.clone();",二者的clone()在类Son1、Son11中是可见的,但对Test1是不可见的,因此(2)(4)处编译不通过。 实例2 packagep2;classMyObject2{protectedObjectclone()throwsCloneNotSupportedException{returnsuper.clo...
Java的类成员訪问权限修饰词有四类:private,无(默认情况下,包訪问权限),protected 和 public。 其权限控制例如以下表所看到的: 特别要注意的是,对于Java中的类(不是其内部成员,两者要区分开),其訪问权限修饰词仅有 public 和 “无”(即包訪问权)两种。而没有 private 和 protected(有一个特例,仅仅有内部类能...
Java的类成员訪问权限修饰词有四类:private,无(默认情况下,包訪问权限),protected 和 public。 其权限控制例如以下表所看到的: 特别要注意的是,对于Java中的类(不是其内部成员,两者要区分开),其訪问权限修饰词仅有 public 和 “无”(即包訪问权)两种。而没有 private 和 protected(有一个特例,仅仅有内部类能...
Java关键字是对Java编译器有特殊含义的字符串,是编译器和程序员的一个约定,程序员利用关键字来告诉编译器其声明的变量类型、类、方法特性等信息。Java语言共定义了如下所示的关键字。本文主要介绍Java protected 关键字(keyword)。 原文地址:Java protected 关键字(keyword) ...
protected_Keyword protected Java Keyword with Examples The protected keyword is an access control modifier that may be applied to a class, a method or a field (a variable declared in a class). If a class or its members are declared as protected are only accessible by the classes of the ...
Access modifiers in Java are keywords that are used to specify the level of access that other classes have to a particular class, method, or field. In the case of private methods, the private keyword is used as an access modifier. When a method is declared private, it can only be access...
In the Java programming language, fields, constructors, methods, and classes can be marked with access modifiers.In this tutorial, we’ll look atprotectedaccess. 2. TheprotectedKeyword While elements declared asprivatecan be accessed only by the class in which they’re declared,theprotectedkeyword...
Java访问权限修饰符共有四种:public、protected、private、没有修饰符(默认访问权限(default accsess))。 访问权限修饰符可以位于定义的类名,属性名和方法名之前。每个访问权限修饰符只能控制它所修饰的对象。如果不提供访问修饰符,就意味着“包访问权限”。所以无论如何,万物都有某种形式的访问控制权。
再看Thinking In Java,这本书里有如下的描述: 1, The levels of access control from "most access" to "least access" are public,protected,package access(which has no keyword), and private. 2, protected also gives package access - that ism other classes in the same package may access protected...