protected | 易学教程

Why can't I call BIOS interrupts from protected mode?

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问题 Right. I've spent over three hours today trying to understand why you can't call a bios ISR when in protected mode. I get that once you set and IDT it wont necessarily be in the usual address for the IVT plus segments dont have a fixed size in Protected mode, etc.. But I still don't get why can't you jsut create a single 4GB segment, map your IDT segments to the BIOS IVT, set everything in ring 0 and call them. Shouldn't that work? Most articles either say: "Remember you cant use BIOS

Protected member behavior once it was inherited.

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I've got some doubts regarding protected identifier. In the first chapter of Sun Certified Java Programmer Study Guide by K.Sierra I found the following information: "Once the subclass-outside-the-package inherits the protected member, that member (as inherited by the subclass) becomes private to any code outside the subclass, with the exception of subclasses of the subclass." I provided sample code which reflects the above statement and it is absolutely clear to me. // Parent class package package1; import package2.Child; public class Parent { protected int i = 5; } // Child class package

how to get if array key is protected?

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问题 i have this type of array:- i want to get array elemtn. context_course Object ( [_id:protected] => 15 [_contextlevel:protected] => 50 [_instanceid:protected] => 2 [_path:protected] => /1/3/15 [_depth:protected] => 3 ) the problem is [_id:protected] i want to there value 15 how can i get if element is protected . thanks. 回答1: If a property is protected, it means the developer of the class doesn't want you to be able to freely directly access or modify its value from the public context. If you

C# - Internal Properties “readable” in quickwatch but not using reflection?

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问题 I see that the "Quick Watch" window has access to all properties, irrespective of access restrictions (internal, protected, private) of a class in a library, even when the library is referenced in a totally different app,lib and namespace. Whereas I am not finding a way to access these using "reflection". I am especially trying to "read" (note - just read) the internal property of an assembly. If this is not possible by design of how "internal" works (not accessible outside the same namespace

How to limit subclassing of public abstact class to types in same assembly and thus allow protected members typed to internal types

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问题 This question is similar to c# internal abstract class, how to hide usage outside but my motiviation is different. Here is the scenario I started with the following: internal class InternalTypeA {...} public class PublicClass { private readonly InternalTypeA _fieldA; ... } The above compiles fine. But then I decided that I should extract a base class and tried to write the following: public abstract class PublicBaseClass { protected readonly InternalTypeA _fieldA; ... } And thus the problem,

Protected Members of Other Instances in Scala

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I just ran into a difficulty while learning Scala. I have an inheritance hierarchy that is essentially equivalent to this: class A { protected def myMethod() = println("myMethod() from A") } class B extends A { def invokeMyMethod(a: A) = a.myMethod() } But trying to compile this sample, I get the error "test.scala:7: error: method myMethod cannot be accessed in A". Coming from Java, my understanding is that protected members should be accessible at any point from a derived class, and nowhere have I seen anything that tells me that protected members in Scala are limited by instance. Does anyone

Accessing protected member functions from test code in C++

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I've been racking my brain trying to think of the best way to access a protected member function from some test code in C++, here's my problem: //in Foo.h Class Foo { protected: void DoSomething(Data data); } //in Blah.h Class Blah { public: Foo foo; Data data; }; //in test code... Blah blah; blah.foo.DoSomething(blah.data); // Here's my problem! Some possible solutions so far: Make the test code class a friend of Foo, but this pollutes Foo with test code Make DoSomething a public function I've looked at creating a test wrapper for Foo, as suggested in this post , however this won't work as

Cannot access protected member of base class in derived class

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问题 I have the following code: struct A { protected: A() {} A* a; }; struct B : A { protected: B() { b.a = &b; } A b; }; It strangely doesn't compile. The culprit is the b.a = &b; assignment: both GCC and clang complain that A() is protected, which shouldn't be a problem because B inherits A. Which dark corner of the standard have I come into? 回答1: The meaning of protected is that the derived type will have access to that member of its own base and not of any random object * . In your case, you

Why does the Object class in Java contain protected methods?

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Why does the Object class in Java contain protected methods, such as clone() and finalize() , if all classes you use or write inherit the instance methods of Object? If class C2 extends C1 , and C1 contains a public method, then the method in C2 (if overridden) must also be public ; Java makes it illegal to put additional restrictions on a method's access when overriding. If C1 contains a protected method, then an overriding method in C2 may be protected or public . These rules apply even if C1 is the Object class. So I think the reason is so that classes (which all inherit from Object ) can

Java - Protected field not accessible from the subclass? [duplicate]

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This question already has an answer here: Understanding java's protected modifier 6 answers I am in process of learning the Java access modifiers. For that, I have created a class Machine : package udemy.beginner.interfaces; public class Machine { public String name; private int id; protected String description; String serialNumber; public static int count; public Machine(){ name = "Machine"; count++; description = "Hello"; } } Then, in another package , I have created a class Robot as a subclass of a car Machine : package udemy.beginner.inheritance; import udemy.beginner.interfaces.Machine;