class

问题 I'm new to Java and am wondering about how to import class files into netbeans and use it. I understand that a class file is machine-readable byte code but I don't care what's going on under the hood. I'd just like to import it into my current project and have it recognize it so I can use the class. Also, the class file is embedded within a JAR file. I imported the JAR file into my libraries folder/tab in the projects window but I don't know how to get my project to recognize the class. It

问题 I'm new to Java and am wondering about how to import class files into netbeans and use it. I understand that a class file is machine-readable byte code but I don't care what's going on under the hood. I'd just like to import it into my current project and have it recognize it so I can use the class. Also, the class file is embedded within a JAR file. I imported the JAR file into my libraries folder/tab in the projects window but I don't know how to get my project to recognize the class. It

问题 Recently I read an interesting discussion on how to make a singleton in Python. One of the solutions was a tricky decorator defining a class inside its code as a substitute for decorated class: def singleton(class_): class class_w(class_): _instance = None def __new__(class2, *args, **kwargs): if class_w._instance is None: class_w._instance = super(class_w, class2).__new__(class2, *args, **kwargs) class_w._instance._sealed = False return class_w._instance def __init__(self, *args, **kwargs):

问题 Recently I read an interesting discussion on how to make a singleton in Python. One of the solutions was a tricky decorator defining a class inside its code as a substitute for decorated class: def singleton(class_): class class_w(class_): _instance = None def __new__(class2, *args, **kwargs): if class_w._instance is None: class_w._instance = super(class_w, class2).__new__(class2, *args, **kwargs) class_w._instance._sealed = False return class_w._instance def __init__(self, *args, **kwargs):

问题 In some C++ code, I use integers to store lots of changing data. To analyze my program, I want to log certain changes to some of the variables, such as how often a certain value is assigned to, and how often that assignment is redundant (the new value is the same as the old value.) If the type were a class Foo, I'd just derive a new LoggingFoo and add my logging data to the member function(s) I was interested in, and then call the parent member function. I'd have to update my code to use the

问题 In python (tested on 2.7.6) all variables are statically bound to a scope at compile time. This process is well described in http://www.python.org/dev/peps/pep-0227/ and http://docs.python.org/2.7/reference/executionmodel.html It is explicitly stated that "If a name binding operation occurs anywhere within a code block, all uses of the name within the block are treated as references to the current block." A function is a code block so the following code with fail because x is assigned after

问题 I have a class with member variables. What is the syntax in PHP to access the member variables from within the class when the class is being called from a static context? Basically I want to call a class method (but not create a new object), but when the class method is called, I want a handful of static constant variables to be initialized that need to be shared among the different class methods. OR if there's a better way to do it then what I'm proposing, please share with me (I'm new to

问题 I have a class with member variables. What is the syntax in PHP to access the member variables from within the class when the class is being called from a static context? Basically I want to call a class method (but not create a new object), but when the class method is called, I want a handful of static constant variables to be initialized that need to be shared among the different class methods. OR if there's a better way to do it then what I'm proposing, please share with me (I'm new to

问题 I have 2 class: class animal{ public function walk(){ walk; } } class human extends animal{ public function walk(){ with2legs; } } This way, if i call human->walk(), it only runs with2legs; But I want the run the parent's walk; too. I know I can modify it this way: class human extends animal{ public function walk(){ parent::walk(); with2legs; } } But the problem is, I have many subclasses and I don't want to put parent::walk(); into every child walk(). Is there a way I can extend a method

问题 I have 2 class: class animal{ public function walk(){ walk; } } class human extends animal{ public function walk(){ with2legs; } } This way, if i call human->walk(), it only runs with2legs; But I want the run the parent's walk; too. I know I can modify it this way: class human extends animal{ public function walk(){ parent::walk(); with2legs; } } But the problem is, I have many subclasses and I don't want to put parent::walk(); into every child walk(). Is there a way I can extend a method