getter-setter

I'm a bit confused about properties in python. Consider the following code class A: @property def N(self): print("A getter") return self._N @N.setter def N(self,v): print("A setter") self._N = v def __init__(self): self._N = 1 class B: @property def N(self): print("B getter") return self.a.N @N.setter def N(self,v): print("B setter") self.a.N = v def __init__(self): self.a = A() if __name__ == '__main__': b=B() b.N = 2 print(b.N, b.a.N) b.N = 3 print(b.N, b.a.N) B should be something like a wrapper for A. It uses getters and setters to map A's properties on itself (of course one could also do

Is there a better standard way to create getters and setters in Java? It is quite verbose to have to explicitly define getters and setters for each variable. Is there a better standard annotations approach? Does Spring have something like this? Even C# has properties. Carl Smotricz I'm not sure if you'd consider it 'standard', but Project Lombok addresses this problem. They use annotations to replace much of the verbosity of Java. Some people are looking at alternative Java sibling languages, such as Groovy or Scala. I'm afraid it will take some years -if at all- before the JSR figures out a

I saw something like the following somewhere, and was wondering what it meant. I know they are getters and setters, but want to know why the string Type is defined like this. Thanks for helping me. public string Type { get; set; } Those are Auto-Implemented Properties (Auto Properties for short). The compiler will auto-generate the equivalent of the following simple implementation: private string _type; public string Type { get { return _type; } set { _type = value; } } That is an auto-property and it is the shorthand notation for this: private string type; public string Type { get { return

I have the following class: class ReportView: NSView { var categoriesPerPage = [[Int]]() var numPages: Int = { return categoriesPerPage.count } } Compilation fails with the message: Instance member 'categoriesPerPage' cannot be used on type 'ReportView' What does this mean? Daniel Krom You just have syntax error when saying = {return self.someValue} . The = isn't needed. Use : var numPages: Int { get{ return categoriesPerPage.count } } if you want get only you can write var numPages: Int { return categoriesPerPage.count } with the first way you can also add observers as set willSet & didSet