instance

问题 With this code: World w = new World(); var data = GetData<World>(w); If I get w with reflection and this can be of type World , Ambient , Domention , etc. How can I get GetData ??? I only have the instance object: var data = GetData<???>(w); 回答1: var type = <The type where GetData method is defined>; var genericType = typeof(w); var methodInfo = type.GetMethod("GetData"); var genericMethodInfo = methodInfo.MakeGenericMethod(genericType); //instance or null : if the class where GetData is

问题 I believe my problem is rather simple: I have a workbook and I'm using it to get some data from another software (SAP). When I export the data from the software, it automatically opens a .xlsx file, then what I'd need to do is copy some of the data from this file, paste on my original workbook, and then close the file. The section of my code which is giving me an error is this one: fileName = "temp1.xlsx" Set wbBasis = Workbooks(fileName) This happens because the "temp1.xlsx" file that was

问题 Looking at source code of Integer class, just stumble at this below line Class<Integer> TYPE = (Class<Integer>) Class.getPrimitiveClass("int"); And getPrimitiveClass is a native method. static native Class getPrimitiveClass(String name); Why it became a native method ? really want to know. How one can create an instance for Class ?? Does that differs with normal way of creating instance for ex : Ex e = new Ex() ? 回答1: The comment above the method definition says: /* * Return the Virtual

问题 Looking at source code of Integer class, just stumble at this below line Class<Integer> TYPE = (Class<Integer>) Class.getPrimitiveClass("int"); And getPrimitiveClass is a native method. static native Class getPrimitiveClass(String name); Why it became a native method ? really want to know. How one can create an instance for Class ?? Does that differs with normal way of creating instance for ex : Ex e = new Ex() ? 回答1: The comment above the method definition says: /* * Return the Virtual

问题 Are there any differences between a class variable and an instance variable with a default value? (especially in terms of their behavior under "normal use", internally I suppose they most likely are implemented differently) In what context should I use which version? Take these two classes as an example: class A: d = 4 class A: def __init__(self, d=4): self.d = d No matter what version you choose, when you run the code below, you'll get the same result: a2 = A() a = A() print(a.d) # 4 a.d = 2

问题 With PyQt5, both of these return the application object: app = QtWidgets.QApplication.instance() app = QtWidgets.qApp for i in app.arguments()[1:]: ... But why does print(QtWidgets.QApplication.instance() is QtWidgets.qApp) print False ? 回答1: The difference between QtWidgets.QApplication.instance() and QtWidgets.qApp is that the latter is a static module variable that must be created when the module is first imported. This results in the following initially baffling behaviour: >>> from PyQt5

问题 Frankly, I do not know even it is possible or not. But what I am trying to do is just like below. I made a class file from ClassFile.java via javac command in terminal. Then I want to get an instance from .java file or .class file. Next, I made another project in eclipse, As you guess this project path and upper file path are completely different. For instance, ClassFile.java/class file can be located in '~/Downloads' folder, the other hand, new eclipse project can be in '~/workspace/'. So I

问题 I know that methods __repr__ and __str__ exist to give a formal and informal representation of class instances. But does an equivalent exist for class objects too, so that when the class object is printed, a nice representation of it could be shown? >>> class Foo: ... def __str__(self): ... return "instance of class Foo" ... >>> foo = Foo() >>> print foo instance of class Foo >>> print Foo __main__.Foo 回答1: When you call print(foo) , foo 's __str__ method is called. __str__ is found in the

问题 I try to get the parent Type of a instance. How can I do ? Example : public class a { public b { get; set; } } public class b { } var a = new a(); a.b = new b(); var parentType = a.b.??GetParentInstanceType()?? 回答1: You can't. You'd need to add a property to the child manually to keep track of the parent: Here is one way: public class A { public B<A> Child { get; set; } } public class B<T> { public T Parent { get; set; } } A a = new A(); a.Child = new B<A>(); a.Child.Parent = a; Type

问题 I am going to attend the Instance Matching of OAEI, now I need to make my results to Alignment Format. In order to achieve it, I have learned official tutorials.(link:http://alignapi.gforge.inria.fr/tutorial/tutorial1/index.html). But there are many differences between the method taught and the method I want. In other words, I can't understand the API. This is my situation: I have 2 rdf file(person11.rdf and person12.rdf respectively.data link is http://oaei.ontologymatching.org/2010/im/index