class

问题 Let's say we have a class foo which has a private instance variable bar . Now let us have another class, baz , which extends foo . Can non-static methods in baz access foo 's variable bar if there is no accessor method defined in foo ? I'm working in Java, by the way. 回答1: No, not according to the java language specification, 3rd edition: 6.6.8 Example: private Fields, Methods, and Constructors A private class member or constructor is accessible only within the body of the top level class (§7

问题 Where is a complete list of the special double-underscore/dunder methods that can be used in classes? (e.g., __init__ , __new__ , __len__ , __add__ ) 回答1: Please take a look at the special method names section in the Python language reference. 回答2: Dive Into Python has an excellent appendix for them. 回答3: If, like me, you want a plain, unadorned list, here it is. I compiled it based on the Python documentation link from the accepted answer. __abs__ __add__ __and__ __call__ __class__ __cmp__ _

问题 Where is a complete list of the special double-underscore/dunder methods that can be used in classes? (e.g., __init__ , __new__ , __len__ , __add__ ) 回答1: Please take a look at the special method names section in the Python language reference. 回答2: Dive Into Python has an excellent appendix for them. 回答3: If, like me, you want a plain, unadorned list, here it is. I compiled it based on the Python documentation link from the accepted answer. __abs__ __add__ __and__ __call__ __class__ __cmp__ _

问题 Where is a complete list of the special double-underscore/dunder methods that can be used in classes? (e.g., __init__ , __new__ , __len__ , __add__ ) 回答1: Please take a look at the special method names section in the Python language reference. 回答2: Dive Into Python has an excellent appendix for them. 回答3: If, like me, you want a plain, unadorned list, here it is. I compiled it based on the Python documentation link from the accepted answer. __abs__ __add__ __and__ __call__ __class__ __cmp__ _

问题 I am extending ArrayList to create a custom ArrayList that can be modified using normal ArrayList methods while iterating over it. For this I am also creating an Iterator. public class SynchronizedList<E> extends ArrayList<E> { // Fields here //Constructors and methods here public class SynchronizedListIterator<E> implements Iterator<E> { public int index; private E current; public boolean hasNext() { synchronized (/* reference to enclosing List object */) { //code goes here } return false; }

问题 How to Conversion ? (Objective C Class -> Delphi XE4 ) and How to use Objective-C Class in static Library from Delphi XE ? Following is the my first trial. But It makes error. Objective C Source // objective C : test.h ---------------------------------------- @interface objc_test : NSObject { BOOL busy; } - (int) test :(int) value; @end // objective C : test.m ---------------------------------------- @implementation objc_test - (int) test :(int) value { busy = true; return( value + 1); } @end

问题 This question already has answers here : Reference — What does this symbol mean in PHP? (18 answers) Closed 5 years ago . What does -> mean/refer to in PHP? In the following from WordPress, I know what the if statement does, for example, but what does the -> do? <?php if ( $wp_query->max_num_pages > 1 ) : ?> 回答1: -> accesses a member of an object. So $wp_query->max_num_pages is accessing the field max_num_pages in the object $wp_query . It can be used to access either a method or a field

问题 According to the C++ specification, are the following two classes equivalently defined? class A { void f() { } }; class B { inline void f() { } }; i.e., is putting the "inline" qualifier on such member function defined in the class definition completely redundant? Followon question: Assuming it is redundant, for code style, would it be sensible to keep the "inline" tag, so a future developer realises that function should be inlined, and does not remove the definition somewhere else and remove

问题 I'm using a modified version of the SimpleImage.php class: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php The edits I found on phpfreaks (http://www.phpfreaks.com/forums/index.php?topic=301811.0), but when I use, the png gets resized but the transparency is black. I make the call like: $max_width = 200; // set a max width $max_height = 150; // set a max height if($imgW > $imgH){ // width is greater // resize to width up to max if($imgW > $max_width) $image-

问题 Hay I have an element like this <span class='a.b'> Unfortunately this class name comes from an eCommerce application and cannot be changed. Can I style a class name with a dot in it? like .a.b { } 回答1: .a\.b { } However there could be browsers around that don't support this. 回答2: Coming very late to this party, but you can use attribute selectors. In your case, to target the class='a.b' element, you could use: [class~="a.b"] {...} // or span[class~="a.b"] {...} Additionally, here is the full