overriding

问题 I have a code and I am not able to get why the output will be "Radial Tire with long".Can somebody help me to understand this code? class Tyre { public void front() throws RuntimeException { System.out.println("Tire"); } public void front(long a) { System.out.println("Radial Tire with long"); } } class TestSolution extends Tyre { public void front() { System.out.println("Radial Tire"); } public void front(int a) throws RuntimeException { System.out.println("Radial Tire with int"); } public

问题 For instance, in the following code: class Animal class Dog extends Animal trait Base { def a: Animal = new Dog } trait Deri extends Base { override val a: Dog } The following error is given: error: overriding value a in trait Deri of type Dog; method a in trait Base of type => Animal needs to be a stable, immutable value; (Note that value a in trait Deri of type Dog is abstract, and is therefore overridden by concrete method a in trait Base of type => Animal) I want to know, since I have

问题 I am trying to implement delayed queue with overriding of messages using Active MQ. Each message is scheduled to be delivered with delay of x (say 60 seconds) In between if same message is received again it should override previous message. So even if I receive 10 messages say in x seconds. Only one message should be processed. Is there clean way to accomplish this? 回答1: The question has two parts that need to be addressed separately: Can a message be delayed in ActiveMQ? Yes - see Delay and

问题 Is there any way to rewrite either: flag llvm description: compile via LLVM default : if os(mingw32) False else True or flag llvm description: compile via LLVM default : True if os(mingw32) ?SET-LLVM=False? and get cabal to work with it? Note: Further down in the same file the llvm flag is used like: if flag(llvm) ghc-options: -fllvm -optlo-O3 and there are many other single high-level flags that translate to multiple ghc-options entries, such as static to -static -optl-static . 回答1: You can

问题 Sometimes I override methods in base classes. Sometimes I even override them with an empty method, because what I want is to prevent the behavior. In the past I would write something like this to show the intent of bypassing the base method : protected override void OnMouseUp(MouseEventArgs e) { // base.OnMouseUp(e); } (I know a commented line of code is a bad thing. I used to do it) But I want to do better: How do I document the intention of the override? specifically: What do I write in the

问题 I would like to change something from mail.thread abstract class. So I inherited mail.thread and wrote override message_tracked function. But it did not call override function... just only called base function. Is it cause by mail.thread is Abstract Model? I tried like that osv.osv and osv.AbstractModel and import this py file in init .py and put 'mail' module in depend dic of openerp .py class mail_thread(osv.osv): _inherit = 'mail.thread' class mail_thread(osv.AbstractModel): _inherit =

问题 I have a certain class structure that looks something like this: class Parent { public Parent(int property) { /* use property */} } class Son extends Parent { public Son(int parentProperty, String sonProperty) { super(parentProperty); /* use son property */ } } I'd like to create builders for both these classes such that: class ParentBuilder { protected int parentProperty; public ParentBuilder parentProperty(int parentPropertyValue) { parentPropertyValue = parentPropertyValue; return this; }

问题 I found a similar question here: overriding methods without subclassing in Java But mine a little different, I have two classes, 1 GUI based, and the other just methods to modify elements in first class. If it just editing the basic function, I meet no problem, but now I want to override a jbutton in first class method from the second class without inheriting it. Where do I have to start? I have temporary solution which is that the second class extends JButton, override method I want to, and

问题 class Person { public String firstname; public String lastname; } Person p1 = new Person("Jim","Green"); Person p2 = new Person("Tony","White"); ArrayList<Person> people = new ArrayList<Person>(); people.add(p1); people.add(p2); System.out.println(people.toString()); I'd like the output to be [Jim,Tony] , what is the simplest way to override the ToString method if such a method exists at all? 回答1: You actually need to override toString() in your Person class, which will return the firstname,

问题 I have a Joomla 3 website and want to override libraries/cms/html/html.php . Is it possible? I tried to use same technique described here How to override Joomla System Messages - message.php template I put my html.php file in templates/MY_TEMPLATE/html/html.php this does not help, neither helps if I put in my template index.php file the following: require_once JPATH_ROOT .'/templates/'. $this->template .'/html/html.php'; 回答1: You can't override it using template overrides. It's an issue we