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问题 This question already has answers here : Is it legal to recurse into main() in C++? [duplicate] (5 answers) Is this code valid under any C standard? (3 answers) Closed 6 years ago . #include <iostream> int main() { main(); std::cout<<"Hello World! "<<std::endl; return 0; } This is the code, How does it behave? Why? 回答1: That's undefined behaviour. You cannot call main() from within a C++ program (section 3.6.1.3 of the standard). Therefore anything can happen. And there's no point in asking

问题 This question already has answers here : Error: Main method not found in class Calculate, please define the main method as: public static void main(String[] args) [duplicate] (5 answers) Closed 4 years ago . Error: Main method not found in class MovieDatabase, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application import java.io.FileInputStream; import java.util.Scanner; import java.util.Arrays; public

问题 I am relatively new to programming and java and am trying to learn how to create a user-defined package from the command-line. I get the following: Error: Could not find or load main class TestPhone . I've reviewed posts on this type of error including the well-commented post here. The post lists 4 steps that the JVM goes through to run a java program: Search for the compiled version of the class. Load the class. Check that the class has a main method with signature static void main(String[])

问题 How do I get this to work, I've tried with and without new keyword: object Main extends App { override def main (args : Array[String] = new Array("default argument")) { println("args(0) = " + args(0)) } } http://ideone.com/5AyTxy (I have tried other [1, 2] methods but I think that its val is causing issues) Docs: http://docs.scala-lang.org/sips/completed/named-and-default-arguments.html#default_arguments PS: I should confirm that I want this to be bound to the args name; rather than to

问题 I am trying to use boost-test, and in particular boost unit testing. I clearly don't understand how is the main function generated and called, all the tutorial says is to define a module and write a test #define BOOST_TEST_MODULE EnfTraderTest BOOST_AUTO_TEST_CASE(CalculateExpectedPriceTest){BOOST_ERROR("Oops");} But, how do I say to my program to run this test ? I already have main function, I would like to decide to run the test or not, from my main function. 回答1: The simplest way to do

问题 Is there a way to make the main class - the one based on the main .fla - static? so we could use it as in java, being able to reference it from other classes, because I have to pass the instance of the main itself as a parameter to a class, otherwise I loose reference. I tried to add static prefix but seems as3 doesn't allow it. 回答1: There is not concept of static class in AS3. You can use the singleton pattern to expose the unique instance of your main class : public class Main extends

问题 If I have the following Java class : public class MyClass { ... public static void main(String[] args) { ... } } Is there any practical difference if I call it in the 2 different ways below ? [1] new Stock_Image_Scanner().main(null); [2] Stock_Image_Scanner.main(null); 回答1: In the first one the constructor gets executed. In the second one it does not. 回答2: main is a static function, and should not be called via an instance. It should only be called via the class name: Stock_Image_Scanner.main

问题 This is my js function <script type="text/javascript"> function callNewActivity() { window.plugins.StartBarcodeReader.gecis(); } </script> This is my StartBarcodeReader.java file package com.blogspot.ehamutcu.barcodereader; import android.content.Intent; import android.support.v7.app.ActionBarActivity; public class StartBarcodeReader extends ActionBarActivity { public void gecis(){ Intent i = new Intent(this,BarcodeReader.class); startActivity(i); } } I want to start new main activity from

问题 Can someone tell me what I am doing wrong here? When I have this code in Eclipse, it is telling me I cannot "make a static reference to a non-static field" when I try to set sheetName to "hi" in the main method. What am I doing wrong here? I know it must be simple, but I searched everywhere and cannot figure it out! public class AutoExpire { private String sheetName; private FileInputStream inputStream; /** * Instantiates the class. */ public AutoExpire() { // do nothing } /** * The main

问题 I've got a problem with an AlertDialog. The code works well, when I put it in a onClick-Listener of a Button, but it doesn't work at all when I put it at the end of my main-method. This is the Method that shows the AlertDialog: void showMaths(){ AlertDialog.Builder alert = new AlertDialog.Builder(LabyRiddle.this); alert.setTitle("Title"); alert.setMessage("Message"); // Set an EditText view to get user input final EditText input = new EditText(LabyRiddle.this); alert.setView(input); alert