methods

问题 I have a for loop that returns values from an array. public static String getPieces(){ for(int y=0; y<=7; y++) for(int x=0; x<=7; x++) return piece[x][y]; } There is a return statement clearly in the method that will return every time it is called. Why does it say missing return statement ? 回答1: Besides the loop being completely pointless (because it will return piece[0][0]), adding an extra return line might help you: public static String getPieces(){ for(int y=0; y<=7; y++){ for(int x=0; x<

问题 I'm completely new to Java, so I'm sorry if my question is dumb. Im working on this assignment, and I've been reading about main methods for hours now, but I just cant figure it out. I put some of my code below. I might be way off here, but what I'm hoping to accomplish is to get the main method to start the constructor, but when I compile I get an error saying "cannot find symbol - constructor Player". Now, Im guessing this has something to do with the string parameters of the constructor,

问题 I'm following the CS106A lectures online. I'm going through the code on Lecture 12, but it's giving me errors in Eclipse. This is my code. It seems the error is because of the word void in my main method. I tried deleting the main method, but of course Java can't run without it. I'm a newbie and no one has explained what the String[] args thing really means, but I've been told to just ignore it and use it. I'd appreciate if someone could explain that to me as well. This errors also comes up

问题 I have a simple php structures. class Ingredient and class Ingredients, i have this code: class Ingredient { public function objectIsValid() { return $validate[0]; } } class Ingredients { public $ingObject; function __construct(){ $ingObject = new Ingredient(); } public function validateData() { if($this->ingObject->objectIsValid() /*** THE ERROR ***/) { echo "OK";} else { echo "NOT";} } } $Ingridients = new Ingredients(); $Ingridients->validateData(); I just can't understand why do i get the

问题 It's a little hard to resume it in a single title, so here my situation. I'm building a C# application that loads a C++ library. I call functions from that C++ DLL. But I'd also like my C++ DLL to call functions from the C# application (that is importing/running it)... Here a piece of code to make it a little more comprehensive : // I'm importing functions from my native code [DllImport(dllFilePath, CallingConvention = CallingConvention.Cdecl)] public static extern int returnIntValue(int

问题 Ok, so I have a method in one class and I'm trying to call it from another class. Form1: public void ChangeBack(Color clr) { this.BackColor = clr; } Form2: public void ChangBackColor_Click(object sender, EventArgs e) { if (ColorDialog.ShowDialog() == DialogResult.OK) { Form1.ChangeBack(ColorDialog.Color); } } But I need to make the ChangeBack method static to be able to call it. So: Form1: public static void ChangeBack(Color clr) { this.BackColor = clr; } But then I can't use "this." as the

问题 I have two methods on my project as defined below: void Person(int ID, double height = 0.0, string team = "Knights") { //my codes } void Person(int ID, double height = 0.0, string team = "Knights", int age = 30) { //my codes } This is where I'm calling the method: Person(1, 2.5, "Dark Ghost"); //calls first method I didn't get any error when I built the project however I'm confused why above calls the first method? and : Person(1, 46.5); //compiler error. 回答1: The C# specification says in §7

问题 Working on a simple tic-tac-toe game in Java. I have a class named GameHelpers . This class should contain useful methods for the game. The game happenes in another class. A method in GameHelpers is ResetGame() . This method is supposed to set the text on all the 9 buttons (the tic-tac-toe board) to blank, set them enabled again, and set a variable to 1. This is it's code: public class GameHelpers { public void resetGame(){ for(int i=0;i<3;i++){ for(int j=0;j<3;j++){ buttons[i][j].setEnabled

问题 I'm trying to get the principles of doing jQuery-style function chaining straight in my head. By this I mean: var e = f1('test').f2().f3(); I have gotten one example to work, while another doesn't. I'll post those below. I always want to learn the first principle fundamentals of how something works so that I can build on top of it. Up to now, I've only had a cursory and loose understanding of how chaining works and I'm running into bugs that I can't troubleshoot intelligently. What I know:

问题 First of all I apologize for my poor english... Hope someone will understand my question and help me... I'm working on a project using lots of $.post call and I want to improve them by adding the same verification for all of them. I do not want to change all scripts one by one so is there any way to override the $.post function to add the same thing to all of them at the same time ? Or maybe a way to trigger another function on each $.post ? Something like : $.post.each(function(){[...]}); or