我们将创建一个父类Bird.java,放在birdpack包中,父类中有一个protected int的成员变量nFeathers; 再分别创建4个Bird类的子类Duck1.java,Duck2.java,Duck3.java,Swan.java,放在duckpack包中,通过在每个子类中调用nFeathers的不同方法说明上述几点 下面的程序并不用于运行,因为访问控制在编译
In the JVM, like in Java, every member has an associated access attribute: public, private, protected, or default. The attribute determines the circumstances in which the member can be accessed. Let m be a member declared in a class c that belongs to a package p. If m is public, it ...
In the JVM, like in Java, every member has an associated access attribute: public, private, protected, or default. The attribute determines the circumstances in which the member can be accessed. Let m be a member declared in a class c that belongs to a package p.If m is public, it ca...
Documentation: Clearly document the intended use of protected members to avoid misuse or unintended access. Access through Subclass Instances: Understand that protected members can be accessed through instances of subclasses, even if the instance is declared in a different package. Learn Java Essentials...
4. But a subclass in another package can access the protected members in the super-class via only the references of subclass or its subclasses. A subclass in the same package doesn’t have this restriction. This ensures that classes from other packages are accessing only the members that are...
🌷 Asubclass(子类) inherits all the members (fields, methods, and nested classes) from its superclass(父类、超类). Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass. ...
可访问性： public > protected > package >private 注意：4. But a subclass in another package can access the protected members in the super-class via only the references of subclass or its subclasses. A subclass in the same package doesn’t have this restriction. This ensures that...
In Java, private and protected are access modifiers that control the visibility and accessibility of class members, including methods. A private method is only accessible within the class where it is defined, while a protected method is accessible within the class and its subclasses. ...
地址:https://docs.oracle.com/javase/tutorial/java/IandI/subclasses.html A subclass inherits all the members (fields, methods, and nested classes) from its superclass. Constructors are not members, A subclass inherits all of the public and protected members of its parent ...
blog.csdn.net|基于11个网页 3. 类设计和 C++ Primer 之 读书笔记 第十五章... ...类设计和protected member免除个别的成员 Exempting Individual Members ... www.blogjava.net|基于 1 个网页 更多释义