properties

问题 @property is a nice way to define getters. When the property is mutable, the reference returned can be used to modify the property in ways not controlled by the class definition. I'll use a banana stand as a motivating analogy, but this issue applies to any class that wraps a container. class BananaStand: def __init__(self): self._money = 0 self._bananas = ['b1', 'b2'] @property def bananas(self): return self._bananas def buy_bananas(self, money): change = money basket = [] while change >= 1

问题 According to Spring Boot documentation, properties can be grouped and a property may appear in more than one group. But at the moment when we create a property class marked with @ConfigurationProperties(prefix="test1") the group name will be the prefix which is test1. Now if I have another property class for example with prefix as "test2" how can I say this latter one has a property from the group test1? --- UPDATE --- Added nested class but it's not working @Configuration @Profile({"wmx"})

问题 I sent a friend a workbook with a macro that includes some sorting. When he tries it he gets: Run-time error '438' Object doesn't support this property or method. He clicks Debug to see the offending code and is taken to a line or two of (fairly simple) data sorting. The text that gets highlighted is: ActiveWorkbook.Worksheets("Data Set").Sort.SortFields.Add2 Key:=Range( _ "H2:H8065"), SortOn:=x1SortOnValues, Order:=x1Descending, DataOption:= _ x1SortNormal Those 3 lines are it, part of a

问题 I'm overriding a property in my derived class that I would like to make it readonly. The C# compiler won't let me change the access modifiers, so it must stay public. What's the best way to do this? Should I just throw an InvalidOperationException in set { } ? 回答1: Having the setter throw an InvalidOperationException in a derived class violates the Liskov Subsitution Principle. Essentially makes the usage of the setter contextual to the type of the base class which essentially eliminates the

问题 So, I'm trying to figure out the best (most elegant with the least amount of code) way to allow overriding specific functions of a property (e.g., just the getter, just the setter, etc.) in python. I'm a fan of the following way of doing properties, due to the fact that all of their methods are encapsulated in the same indented block of code (it's easier to see where the functions dealing with one property stop and the functions dealing with the next begin): @apply def foo(): """A foobar"""

问题 I have a object with all my users, like so: var users = {user1:{}, user2:{}} , And every user has a isPlaying property. How do I get all users that have isPlaying false? 回答1: You should use Object.keys , Array.prototype.filter and Array.prototype.map : // This will turn users object properties into a string array // of user names var userNames = Object.keys(users); // #1 You need to filter which users aren't playing. So, you // filter accessing users object by user name and you check that //

问题 I've been building my program in the "Debug X86-64" mode (Xcode 3.6) and everything works flawlessly. However, I just tried switching to "Release X86-64" mode and upon compiling received the following errors for each of my properties: Synthesized property 'x' must either be named the same as a compatible ivar or must explicitly name an ivar. Where 'x' is one of my properties, the first being 'company' (I received 51 errors of this type.). In my .h interface file, I've listed the items this

问题 I have a maven java project, with a properties file in the src/main/resources directory. I've packaged the jar without the properties file in the jar, so it can be deployed to different environments with different settings, but the unit tests are failing The project structure is Properties Application Project |-- pom.xml `-- src |-- main |-- java | `-- java classes |-- resources | `-- myProps.properties `-- target |--properties-app.jar myProps.properties The values are loaded in this file

问题 I have a maven java project, with a properties file in the src/main/resources directory. I've packaged the jar without the properties file in the jar, so it can be deployed to different environments with different settings, but the unit tests are failing The project structure is Properties Application Project |-- pom.xml `-- src |-- main |-- java | `-- java classes |-- resources | `-- myProps.properties `-- target |--properties-app.jar myProps.properties The values are loaded in this file

问题 I havea TableView, and I access properties of the list's objects as follows. This works just fine. <TableColumn fx:id="dateColumn" editable="false" prefWidth="135.0" text="Date"> <cellValueFactory> <PropertyValueFactory property="date" /> </cellValueFactory> </TableColumn> However, I'd like to access a nested property of the object, for example: <TableColumn prefWidth="100.0" text="Course"> <cellValueFactory> <PropertyValueFactory property="house.bathroom"/> </cellValueFactory> </TableColumn>