overriding

问题 Look, I make a modification in a branch and then pick a commit from a similar branch, which does not have this modification. I wonder if modification must be rolled back or not. Initially, both A and B branches have a full copy of the same file begin 123 456 def f 789 klm end But they diverge. First, A moves def f into the end of file, producing refactored A begin 123 456 789 klm end def f Now, if we cherry-pick B on top of this A, the original file is recovered ( def f is back in the middle

问题 I want to override the method getItem() found in file \administrator\components\com_content\models\article.php line 257 public function getItem($pk = null) I need to modify the return value based on the value of variable $pk. How do I do this? I am hoping to find a way to not to modify the core. Also, if override is possible, can I make a plugin out of it? Am using Joomla 2.5.9 回答1: With some more searching, came across a beautiful solution. All I needed was to override the model (article.php

问题 This is my first time working with classes, so excuse my ignorance. I have a Pet class that is my base class. I have two children classes, Dog and Cat. What I'm trying to do is have the Cat and Dog methods override the Pet method by saying "Woof!" and "Meow!" instead of speak. Then in another form I have to print the information (name, color, and them speaking) on a button press. class Pet { protected string name, color, food; public string Name { get { return name; } set { name = value; } }

问题 I want to compose a type of another type, but replace one of the fields (which is an interface value) with a fake. The problem I am getting is the underlying field is being used, so I can't seem to override the field. I've demoed the problem here: https://play.golang.org/p/lHGnyjzIS-Y package main import ( "fmt" ) type Printer interface { Print() } type PrinterService struct {} func (ps PrinterService) Print() { fmt.Println("PrinterService") } type Service struct { Client PrinterService }

问题 Polymorphism is the ability to take many forms. Method overriding is runtime polymorphism. My questions are: Is there anything like static polymorphism in Java? Can method hiding be considered a form of polymorphism? In this question's answer, it is said that static methods are not polymorphic. What is the reason for that? 回答1: If we run this test class A { static void x() { System.out.println("A"); } } class B extends A { static void x() { System.out.println("B"); } } class Test { public

问题 When I let Android Studio generate override method it will generate the method with strange parameter names. For instance according to documentation onCheckedChanged should look like this: public void onCheckedChanged(CompoundButton buttonView, boolean isChecked){} but i got public void onCheckedChanged(CompoundButton compoundButton, boolean b){} or onDateSet in DatePickerDialog i got: onDateSet(DatePicker datePicker, int i, int i1, int i2) instead of onDateSet(DatePicker view, int year, int

问题 Suppose i have : class Album(models.Model): photos = models.ManyToManyField('myapp.Photo') photo_count = models.IntegerField(default = 0) class Photo(models.Model): photo = models.ImageField(upload_to = 'blahblah') What is want is, everytime i call .add() method, increment the photo_count on Album class, so i'm thinking to override .add() method. The problem is, i can't import the .add() 's class since it is inside a method, so it is like def->class->def . So is there anyway to override .add(

问题 Suppose i have : class Album(models.Model): photos = models.ManyToManyField('myapp.Photo') photo_count = models.IntegerField(default = 0) class Photo(models.Model): photo = models.ImageField(upload_to = 'blahblah') What is want is, everytime i call .add() method, increment the photo_count on Album class, so i'm thinking to override .add() method. The problem is, i can't import the .add() 's class since it is inside a method, so it is like def->class->def . So is there anyway to override .add(

问题 I would like to do the above. Ive overridden many files in the past...block, model, helper....but this one eludes me. Can anyone see what im doing wrong here: (ive edited this code...to include some of the recomendations now...) Heres my folder structure (2 controller locations as a test): /Idigital/Idgeneral/etc/config.xml /Idigital/Idgeneral/controllers/Checkout/CartController.php /Idigital/Idgeneral/controllers/CartController.php Heres my config.xml: <?xml version="1.0"?> <config> <modules

问题 When I let Android Studio generate override method it will generate the method with strange parameter names. For instance according to documentation onCheckedChanged should look like this: public void onCheckedChanged(CompoundButton buttonView, boolean isChecked){} but i got public void onCheckedChanged(CompoundButton compoundButton, boolean b){} or onDateSet in DatePickerDialog i got: onDateSet(DatePicker datePicker, int i, int i1, int i2) instead of onDateSet(DatePicker view, int year, int