methods

问题 A Java method call may be parameterized like in the following code: class Test { <T> void test() { } public static void main(String[] args) { new Test().<Object>test(); // ^^^^^^^^ } } I found out this is possible from the Eclipse Java Formatter settings dialog and wondered if there are any cases where this is useful or required. EDIT Based on Arne's excellent answer i came up with the following conclusion: In addition to improved type safety as Arne's example illustrates a parameterized

问题 They don't seem to be accessible from ActionView::TestCase 回答1: That's right, helper methods are not exposed in the view tests - but they can be tested in your functional tests. And since they are defined in the controller, this is the right place to test them. Your helper method is probably defined as private , so you'll have to use Ruby metaprogramming to call the method. app/controllers/posts_controller.rb: class PostsController < ApplicationController private def format_something "abc"

问题 I'm migrating from SubSonic to EF4. In SubSonic models had a function called Save, if the key of the model was 0 an insert was done, otherwise an update. Is there a way to make a generic Save function like in SubSonic? For exmaple using an extension method? 回答1: Yes but you have to do it yourselves. Try something like this: public interface IEntity { int Id { get; set; } } ... public void SaveOrUpdate<T>(T entity) where T : IEntity { using (var context = new MyContext()) { if (entity.Id == 0)

问题 This question already has answers here : How to find out who called a method? (9 answers) Closed 5 years ago . I want to write a debug function or method that will help print useful information. When it is called, I need: the memory address of the calling object (if called by an object) the method signature of the caller (or the name of the method), or the name of the function the class name that owns that method or function Is it possible to get this information without passing a whole bunch

问题 EDIT : see bottom First off I searched for an answer before asking this one, but as you can see with the title I have no idea how this is called and I will edit the question whenever I can. Please forgive me on this. I have the following abstract class : public abstract class ValidableDTO implements Serializable { public abstract boolean isValid(); public abstract boolean equals(ValidableDTO compared); // EDIT : new solution public abstract <T extends ValidableDTO> boolean equals(T compared);

问题 I'm wondering if there's a better way to add dynamic methods to an existing object. Basically, I am trying to assemble new methods dynamically and then append them to an existing function. This demo code works. builder = function(fn, methods){ //method builder for(p in methods){ method = 'fn.' + p + '=' + methods[p]; eval(method); } return fn; } test = {} test = builder(test, {'one':'function(){ alert("one"); }','two':'function(){ alert("two"); }'} ); test.one(); test.two(); 回答1: You don't

问题 I want to replace calls to a given class with calls to anther class within a method body whilst parsing compiled class files... or put another way, is there a method of detecting usages of a given class in a method and replacing just that part of the method using something like javaassist. for example.. if I had the compiled version of class A { public int m() { int i = 2; B.multiply(i,i); return i; } } is there a method of detecting the use of B and then altering the code to perform class A

问题 lately I have been writing a lot of tiny plugins for my web projects but I am still very much a beginner in plugin authoring. I have been doing a lot of reading on jquery plugins but I simply cannot wrap my head around methods . Here is what my current plugins mostly look like: (function($){ $.fn.extend({ myHelper: function(options) { var defaults = { some: 'defaults' } var options = $.extend(defaults, options); return this.each(function() { var o = options; function next(target) { // do

问题 I hold body of method in string. I want to create method dynamically. But I don't know, how to set its body. I saw very tedious way using CodeDom. And I saw using Emit with OpCodes. Is any way to use ready code from string variable? string method_body = "return \"Hello, world!\";"; //there is method body DynamicMethod dm = new System.Reflection.Emit.DynamicMethod("My_method", typeof(string), new Type[] { }); //any way to create method dynamically //any way to set body string result = (string

问题 Scala functions has following methods for chaining: fn1.andThen(fn2) fn1.compose(fn2) But how can be written this case: I have function cleanUp() which has to be called always as last step. And I have a bunch of other functions, like that: class Helper { private[this] val umsHelper = new UmsHelper() private[this] val user = umsHelper.createUser() def cleanUp = ... // delete user/ and other entities def prepareModel(model: TestModel) = { // create model on behalf of the user } def commitModel(