Getters and setters are auto-generated in Kotlin. If you write: val isEmpty: Boolean It is equal to the following Java code: private final Boolean isEmpty; public Boolean isEmpty() { return isEmpty; } In your case the private access modifier is redundant – isEmpty is private by default and can be accessed only by a getter. … Read more
Yes, if your Column annotation has the runtime retention @Retention(RetentionPolicy.RUNTIME) @interface Column { …. } you can do something like this for (Field f: MyClass.class.getFields()) { Column column = f.getAnnotation(Column.class); if (column != null) System.out.println(column.columnName()); } UPDATE : To get private fields use Myclass.class.getDeclaredFields()
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; } }
I think the main reason is simply that the syntax is too explicit for this to work any other way. This code: public override int MyProperty { get { … } set { … } } is quite explicit that both the get and the set are overrides. There is no set in the base … Read more
In interface you can define only getter for your property interface IFoo { string Name { get; } } However, in your class you can extend it to have a private setter – class Foo : IFoo { public string Name { get; private set; } }
This changed as of the ES2015 (aka “ES6”) specification: JavaScript now has proxies. Proxies let you create objects that are true proxies for (facades on) other objects. Here’s a simple example that turns any property values that are strings to all caps on retrieval, and returns “missing” instead of undefined for a property that doesn’t … Read more
Sometimes Xcode when overrides methods adds class func instead of just func. Then in static method you can’t see instance properties. It is very easy to overlook it. That was my case.
Setters and Getters apply to computed properties; such properties do not have storage in the instance – the value from the getter is meant to be computed from other instance properties. In your case, there is no x to be assigned. Explicitly: “How can I do this without explicit backing ivars”. You can’t – you’ll … Read more
Try this: Python Property The sample code is: class C(object): def __init__(self): self._x = None @property def x(self): “””I’m the ‘x’ property.””” print(“getter of x called”) return self._x @x.setter def x(self, value): print(“setter of x called”) self._x = value @x.deleter def x(self): print(“deleter of x called”) del self._x c = C() c.x = ‘foo’ # … Read more
Prefer properties. It’s what they’re there for. The reason is that all attributes are public in Python. Starting names with an underscore or two is just a warning that the given attribute is an implementation detail that may not stay the same in future versions of the code. It doesn’t prevent you from actually getting … Read more