methods

问题 I have a very quick question. Whenever the user downloads my app, for some reason the volume is at zero. I want to raise the volume whenever the user enters the app for the first time, and update something. Whenever the app is created, I want the users volume to be increased, and the user can change that later. If the user leaves the app (home menu) and comes back, that code should not execute. So, I thought I would use the Application class: That didn't work, since to do the update I

问题 To begin with I have three classes. One called: Temperature (superclass) Weather (subclass superclass) UseTemperature (subclass that holds main method) For this program the main method is only supposed to display the temperature in Celsius and wind speed. I do not know what the issue is though.. My issue is that setWindSpeed/getWindSpeed cannot be found within UseTemperature. //TEMPERATURE: public class Temperature { private double degrees; public void setDegrees (double degrees) { this

问题 I create buttons in my application by: List<Button> btnslist = new List<Button>(); for (int i = 0; i < nbrofbtns; i++) { Button newButton = new Button(); btnslist.Add(newButton); this.Controls.Add(newButton); newButton.Width = btnsidelength; newButton.Height = btnsidelength; newButton.Top = btnsidelength * Convert.ToInt32(Math.Floor(Convert.ToDouble(i / Form2.puzzlesize))); newButton.Left = btnsidelength * Convert.ToInt32( Math.Floor(Convert.ToDouble(i)) - Math.Floor((Convert.ToDouble(i)) /

问题 Can you please tell me how I can invoke a function when I make a meteor method/call. For test purposes and keeping it simple, I get a value of 'undefined' on the client console. Server.js Meteor.methods({ testingFunction: function() { test() } }); function test(){ var name = 'test complete' return name } client.js Template.profile.events({ 'click #button': function (event) { event.preventDefault(); Meteor.call('testingFunction', function(error, response) { if (error) { console.log(error); }

问题 I have a method drive that goes like this: public double drive(double milesTraveled, double gasUsed) { gasInTank -= gasUsed; return totalMiles += milesTraveled; } I know I can't return multiple values from a method, but that's kind of what I need to do because I need both of these values in my main method, and as it is now it's obviously only returning the one. I can't think of anything that would work. Sorry if this is a super beginner question. What can I do to get both values to return

问题 I build a main class runs 5 classes, and make them able to pass string to each other. I just post main class + class 1 and 4. Main class: public class main { public static void main(String[] args){ class4 c4 = new class4(c1); class3 c3 = new class3(c4); class2 c2 = new class2(c3); c2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c2.setSize(200,100); c2.setLocationRelativeTo(null); c2.setVisible(true); class1 c1 = new class1(c2); c1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c1.setSize

问题 In the ruby pickaxe book, there is a line that says attr_accessor is a class method defined in class Module But isn't attr_accessor an instance method? Am I missing something here? 回答1: Yes, all documentation I can find agrees that attr_accessor is an instance method of Module, and I believe it would have to be an instance rather than class method to do what it does. My guess is that it's just a typo. The authors were probably just trying to point out that rather than being part of the

问题 I am implementing a woocommerce website. In here I am providing a search bar to search only the products. <form action="<?php echo get_site_url() ?>" method="GET"> <div class="input-group"> <input type="search" name="s" class="form-control" placeholder="Search Products" required> <input type="hidden" name="post_type" value="products" /> <div class="input-group-btn"> <button class="btn btn-default" type="submit"> <i class="fa fa-search" aria-hidden="true"></i> </button> </div> </div> </form>

问题 I have no reputation to comment on a question, so I am making a new one. But my question is related to another question: How to convert model data objects array to dataProvider So.... if you read the question, my doubt is: I need to ask for help to a new thing that this subject rises. I would like to get a function result as the data of a column, but this function is inside the Friend object. Its not possible to do: array( 'name'=>$model->friends->getAttributeLabel('column_of_friend_model'),

问题 According to Oracle I should be able to apply methods like .intValue() and .compareTo() to doubles but when I write dbl.toString() in NetBeans, for example, the IDE tells me that doubles can't be dereferenced. I can't even cast them to Integers in the form (Integer) dbl ! I have JDK 1.6 and NetBeans 6.9.1. What's the problem here? 回答1: The problem is your understanding of objects vs. primitives. More than anything else, you just need to recognize that the capitalized names are object classes