overriding

问题 I'm trying to figure out the best way of writing a unit test for an overridden method which calls super() as the last step. Basically, I want to massage parameters before they're used in the base class. Here's an example of a method: @Override public JobExecution run(Job job, JobParameters passedParams) throws JobExecutionAlreadyRunningException, JobRestartException { JobParameters launchParameters; if(passedParams.isEmpty()) { launchParameters = jobParameterSetter.getJobParameters(); } else

问题 I want to override the onErrors method in jquery.validate.unobtrusive.js to display error messages as hyper links to the html elements. However, I don't want to change the method in jquery.validate.unobtrusive.js since this file gets updated as newer versions become available. I have read that I can create an external JS file and include the onErrors function there. In my html file, if I include the external JS file AFTER I include jquery.validate.unobtrusive.js then it should automatically

问题 I want to override the onErrors method in jquery.validate.unobtrusive.js to display error messages as hyper links to the html elements. However, I don't want to change the method in jquery.validate.unobtrusive.js since this file gets updated as newer versions become available. I have read that I can create an external JS file and include the onErrors function there. In my html file, if I include the external JS file AFTER I include jquery.validate.unobtrusive.js then it should automatically

问题 I would like to force SubClasses to @Override method from SuperClass . Method in SuperClass can't be abstract , cause I wanna provide some basic implementation. Here is example of my code: public abstract class GenericModel<T extends GenericModel> { long id, counter; public String methodToBeOverridenInSubClass(String name) { // some basic implementation // rest details will be provided by subclass return name; } } public class SubClass extends GenericModel<SubClass> { @Override public String

问题 I'm having difficulty finding the (what I'm sure is a very common) design pattern to work around the following problem. Consider this piece of code: class AA {}; class BB : public AA {}; class A { public: virtual void foo(AA& aa) = 0; }; class B : A { public: void foo(BB& bb){cout<<"B::foo"<<endl;} }; int main() { B b; BB bb; b.foo(bb); } This code will not compile because the class B does not override the pure virtual function 'foo'. The compiler considers the foo that B declares only as an

问题 I'm having difficulty finding the (what I'm sure is a very common) design pattern to work around the following problem. Consider this piece of code: class AA {}; class BB : public AA {}; class A { public: virtual void foo(AA& aa) = 0; }; class B : A { public: void foo(BB& bb){cout<<"B::foo"<<endl;} }; int main() { B b; BB bb; b.foo(bb); } This code will not compile because the class B does not override the pure virtual function 'foo'. The compiler considers the foo that B declares only as an

问题 When we override a method in a subclass, we call the superclass method within this method, for example: protected void onSizeChanged(int w, int h, int oldw, int oldh) { width = w ; height = h ; Log.d(TAG, "onSizeChanged: width " + width + ", height "+ height); super.onSizeChanged(w, h, oldw, oldh); } So why do we need to call super.onSizeChanged() ? I delete the line super.onSizeChanged() , and the result is the same as with it. Or the same in onCreate method, we call super.onCreate() . 回答1:

问题 I would like to replace parent function (Somefunc) in child class, so when I call Main procedure it should fail. Is it possible in Perl? Code: package Test; use strict; use warnings; sub Main() { SomeFunc() or die "Somefunc returned 0"; } sub SomeFunc() { return 1; } package Test2; use strict; use warnings; our @ISA = ("Test"); sub SomeFunc() { return 0; } package main; Test2->Main(); 回答1: When you call Test2->Main() , the package name is passed as the first parameter to the called function.

问题 I have a very specific problem about the method java.lang.Enum.values(). I would like to override its javadoc. Very precisely, the current javadoc for this is, after I created my own enum: public static MyClass.MyEnum[] values() ... This method may be used to iterate over the constants as follows: for (MyClass.MyEnum c : MyClass.MyEnum.values()) System.out.println(c); Returns: ... But in my company System.out calls are considered bad practice so I would like it not to be shown. My first try

问题 I've come across a strange behaviour in .NET/Reflection and cannot find any solution/explanation for this: class A { public virtual string TestString { get; set; } } class B : A { public override string TestString { get { return "x"; } } } Since properties are just pairs of functions ( get_PropName() , set_PropName() ) overriding only the "get" part should leave the "set" part as it is in the base class. And this is just what happens if you try to instanciate class B and assign a value to