accessor

Using reflection to set an object property

由 无人久伴 提交于 2019-11-28 18:18:38
I getting class by name and i need to update them with respective data and my question is how to do it with java I want to add the method some dummy data . I don't know the class type I just getting the class name and use reflection to get his data I use this code to get the class instance and Class<?> classHandle = Class.forName(className); Object myObject = classHandle.newInstance(); // iterate through all the methods declared by the class for (Method method : classHandle.getMethods()) { // find all the set methods if (method.getName().matches("set[A-Z].*") And know that I find the list of

What are the differences amongst Python's “__get*__” and “_del*__” methods?

由 巧了我就是萌 提交于 2019-11-28 16:01:45
问题 I just started learning Python a few months ago, and I'm trying to understand the differences between the different __get*__ methods: __get__ __getattr__ __getattribute__ __getitem___ And their __del*__ equivalents: __del__ __delattr__ __delete__ __delitem__ What are the differences between these? When should I use one over the other? Is there a specific reason why most of the __get*__ methods have __set*__ equivalents, but there is no __setattribute__ ? 回答1: The documentation for every

Directly accessing an instance variable vs. Using an accessor method

由 那年仲夏 提交于 2019-11-28 15:30:21
Can anyone explain the difference between accessing an instance attribute via self.attribute and by @attribute ? sepp2k self.attribute calls the method attribute . self.attribute = value calls the method attribute= with the argument value . @attribute and @attribute = value get/set the value of the instance variable @attribute . So basically they're two entirely different things. However if you call attr_accessor :attribute it defines the method attribute to return @attribute and the method attribute=(value) to set @attribute = value . So in that case, there is no difference. "Accessing

What are 'get' and 'set' in Swift?

由 核能气质少年 提交于 2019-11-28 13:52:58
问题 I'm learning Swift and I'm reading The Swift Programming Language from Apple, I have no Objective C background (only PHP, JS, and other but no Obj C) On page 24-25 I see this code: //...Class definition stuff... var perimeter: Double { get { return 3.0 * sideLength } set { sideLength = newValue / 3.0 } } //...Class continues... This part is NOT specified in the book and I can't get what those are for. Can anyone explain me what get and set are? 回答1: That's actually explained right before the

What's the difference between using obj-c accessors and using dot syntax?

由 雨燕双飞 提交于 2019-11-28 11:40:09
问题 Since I've started on iPhone development I've been kinda confused as to which is the best way to access data as a member in a Class. Let's say I have a class called MyClass, and in it I have: @interface MyClass : NSObject { int myInt; } @property (nonatomic, assign) int myInt; In the implementation, is it better to do this: myObject.myInt = 1; Or this? [myObject setMyInt:1]; This goes for reading the value too. int newInt = myObject.myInt; vs. int newInt = [myObject myInt]; 回答1: It doesn't

F# Higher-order property accessors

由 99封情书 提交于 2019-11-28 09:11:59
问题 I just upgraded my prototyping tuple to a record. Someday it may become a real class. In the meantime, I want to translate code like this: type Example = int * int let examples = [(1,2); (3,4); (5,6)] let descs = Seq.map (fst >> sprintf "%d") examples to this: type Example = { Field1 : int Field2 : int Description : string } let examples = [{Field1 = 1; Field2 = 2; Description = "foo"} {Field1 = 3; Field2 = 4; Description = "bar"} {Field1 = 5; Field2 = 6; Description = "baz"}] let descs = Seq

Dynamically accessing a pandas dataframe column

由 ⅰ亾dé卋堺 提交于 2019-11-28 08:52:45
问题 Consider this simple example import pandas as pd df = pd.DataFrame({'one' : [1,2,3], 'two' : [1,0,0]}) df Out[9]: one two 0 1 1 1 2 0 2 3 0 I want to write a function that takes as inputs a dataframe df and a column mycol . Now this works: df.groupby('one').two.sum() Out[10]: one 1 1 2 0 3 0 Name: two, dtype: int64 this works too: def okidoki(df,mycol): return df.groupby('one')[mycol].sum() okidoki(df, 'two') Out[11]: one 1 1 2 0 3 0 Name: two, dtype: int64 but this FAILS def megabug(df,mycol

Underscores not displayed in WPF

由 半世苍凉 提交于 2019-11-28 07:02:26
问题 On my whole application, I've some underscores (_) which are not displayed. It's due to the accessor. But how can I disable it? Application wide? I don't have them on labels, textboxes, ... Thank you 回答1: To disable underscores globally for all labels you can override the default template for labels like this: <Style x:Key="{x:Type Label}" TargetType="{x:Type Label}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Label}"> <Border Background="{TemplateBinding

What is the definition of “accessor method”?

由 非 Y 不嫁゛ 提交于 2019-11-28 02:42:28
问题 I've been having an argument about the usage of the word "accessor" (the context is Java programming). I tend to think of accessors as implicitly being "property accessors" -- that is, the term implies that it's more or less there to provide direct access to the object's internal state. The other party insists that any method that touches the object's state in any way is an accessor. I know you guys can't win the argument for me, but I'm curious to know how you would define the term. :) 回答1:

public variables vs private variables with accessors

由 你说的曾经没有我的故事 提交于 2019-11-27 22:45:14
Has anyone else seen people do this: private string _name; public string Name{ get{ return _name; } set{ _name = value;}} I understand using accessors if you are going to exercise some sort of control over how it gets set or perform some sort of function on it when there is a get. But if you are just going to do this, why not just make the variable public to begin with? Am I missing something? Robert Rossney If you make the member a public field, then you can't later refactor it into a property without changing the interface to your class. If you expose it as a property from the very beginning
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