overriding

问题 My dilemma is as follows: I have a custom subclass of UIImage (I've added some serialization methods i.e. initWithCoder, encodeWithCoder), and I would like to apply my custom subclass as a variable to a UIImageView, or at least a subclass of UIImageView. As you are aware, UIImageView has a variable called "image", that is of type UIImage. I'd like to override this variable with my subclass. My goal is to have a UIimageView that will respond to archivedDataWithRootObject without crashing with

问题 Is there any elegant way to apply polymorphism in this case? The parser provides the following classes at runtime: class io.swagger.v3.oas.models.media.Schema //is parent of the rest : class io.swagger.v3.oas.models.media.ComposedSchema class io.swagger.v3.oas.models.media.ArraySchema class io.swagger.v3.oas.models.media.StringSchema class io.swagger.v3.oas.models.media.ObjectSchema I'd like to have function for each class with the same name and simple, short method which will cast and call

问题 I want to know if user is scrolling up or down. I have began to override the OnGestureListener.onScroll() method and set my GestureDetector for the ListView . public class ContactList extends ListView { GestureDetector gestureDetector; public ContactList(Context context) { super(context); initView(); } public ContactList(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(); } public ContactList(Context context, AttributeSet attrs) { super(context,

问题 The thing is that I want to override the CSS classes of primeng and change some colors. No matter how I do it it doesn't change. If change the ViewEncapsulation to none the component doesn't even appear. I've tried something like this: .ui-chkbox-box.ui-state-active, .ui-radiobutton-box.ui-state-active { border: 1px solid red !important; background: red !important; color: #FFFFFF; } Trying to override the properties in the component css but it still doesn't work. I know other people have

问题 I want to reduce the number of image files that my parent theme produces. After a little research I found that for this I need to override a function from a php file ( not function.php ) of the parent theme, but this is impossible because this function is not pluggable (not wrapped in a if (!function_exists()) condition). For now, I just wrapped the parent function in a if (!function_exists()) condition and overridden it in my child theme function.php file. In the described situation, is

问题 I'd like to customize the display of an enumeration class using matlab.mixin.CustomDisplay . If I have a regular (non-enumeration) class such as the following: classdef test < handle & matlab.mixin.CustomDisplay properties value end methods function obj = test(value) obj.value = value; end end methods (Access = protected) function displayScalarObject(obj) disp(['hello ', num2str(obj.value)]) end end end then everything works fine - for example, >> a = test(1) a = hello 1 But if I have an

问题 I am attempting to override a method declaration within an interface that extends another interface. Both of these interfaces use generics. According to the Java tutorials, this should be possible, but the example does not use generics. When I try to implement it, the compiler shows the following error (I've replaced names because some of the code is not my own.): myMethod(T) in InterfaceExtended clashes with myMethod(T) in Interface; both methods have the same erasure, but neither overrides

问题 I am developing an Android application which makes use of the ScanResult object. This object is in the form of: [SSID: __mynetwork__, BSSID: 00:0e:2e:ae:4e:85, capabilities: [WPA-PSK-TKIP][ESS], level: -69, frequency: 2457, timestamp: 117455824743] How would I override only the equals() method without creating a customer class which extends it in order to compare only the SSID , BSSID , capabilties , level and frequency attributes only? In other words, in the equals method I want to eliminate

问题 I'm a bit confused to the, I guess concept, of the Dynamic/Static types of a reference variable and Dynamic Method Resolution in Java. Consider: public class Types { @Override public boolean equals(Object obj){ System.out.println("in class Types equals()"); return false;//Shut-up compiler! } public static void main(String[] args){ Object typ = new Types(); typ.equals("Hi");//can do this as String is a subclass of Object } } First: the reference variable typ is of type Types, isn't it?! So

问题 I'll start with a code example: class A { public A() { f(); //When accessed through super() call this does not call A.f() as I had expected. } public void f() {} //I expect this to be called from the constructor. } class B extends A { private Object o; public B() { super(); o = new Object(); //Note, created after super() call. } @Override public void f() { //Anything that access o. o.hashCode(); //Throws NullPointerException. super.f(); } } public class Init { public static void main(String[]