methods

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I am trying to make a logic for executing a random method. Let's say for example I have 10 methods, I need to run one of them selected at random. The main method will reside in the ActionController of my Rails 3.2 app which will have the logic and the 10 methods inside. 回答1: Pick a random method

问题 Learning Java. I have two files, each containing one java class. When I run the file with the main method, I get the following error: Exception in thread "main" java.lang.IllegalAccessError: failed to access class TapeDeck from class TapeDeckTestDrive (TapeDeck is in unnamed module of loader 'app'; TapeDeckTestDrive is in unnamed module of loader com.sun.tools.javac.launcher.Main$MemoryClassLoader @18bf3d14) at TapeDeckTestDrive.main(TapeDeckTestDrive.java:3) class TapeDeckTestDrive{ public

问题 I'm new in c# or any type of programming language. When I see codes in c# I found there are lot of confusions are over here. one of them I want to clarify from here. Methods common structure is <modifier><return type><method name>() { //do any thing return <abc which should same as return type which declared above>; } in above said example I saw many times in <return type> use of <class name> , <dictionary> etc. but natural these are also user defined types. so this also should be here. But,

问题 class Character: def __init__(self): self.name = "" self.health = 1 self.health_max = 1 class Player(Character): def __init__(self): Character.__init__(self) self.state = 'normal' self.health = 10 self.health_max = 10 class Monster(Character): def Dragon(self): self.name = "Dragon" self.health = 20 def Goblin(self): name = "Goblin" health = 5 p = Player() p.name = raw_input("Please enter your name: ") print p.name print p.state print p.health print p.health_max m = Monster() enemy = m.Dragon

问题 I'm a novice ruby programmer and although this code works, I'm wondering how I can improve it. I have very limited knowledge on lambdas and procs and the like, but any advice would be great. Is there any way to simplify the if else statements in each case? Also, is there any alternative way to the case statement skipped instead of making almost the entirety of the code one big if else statement? def rps(roll) roll_ops = ["rock", "paper", "scissors"] pick = roll_ops.sample result = nil if roll

问题 Can I use interface method instead of delegate? How? I found searching that interface method is faster than using delegates. I would appreciate a simple code snippet. 回答1: In theory, it's possible to accomplish everything done by delegates with interfaces (Java has no delegates, for instance) containing a single method. However, it makes the code more verbose and adds little benefit. Then again, it's possible to do everything without classes and possibly do it faster. That doesn't mean you

问题 I have been studying as much as I can about the Module Pattern suggested by the Yahoo YUI Blog. I've noticed that the YUI offers the ability to create a new empty namespace object without overwriting an existing one of the same name like so: YAHOO.namespace("myProject"); Which can then be called and used with YAHOO.myProject (Reminder: if YAHOO.myProject already exists it is not overwritten) How can I achieve a similar effect using plain javascript, and without using the YUI? Please explain

问题 Will the program: #include <stdio.h> struct foo { void blah() {printf("blah\n");} int i; }; void main(int, char**) { ((foo*)NULL)->blah(); } Ever crash, or do anything other than output blah , on any compiler you are aware of? Will any function crash, when called via a NULL pointer, if it doesn't access any members (including the vtable)? There have been other questions on this topic, for instance Accessing class members on a NULL pointer and Is it legal/well-defined C++ to call a non-static

问题 I have seen it first time ... in a method signature. I tried to access a .class file. It has a method defined as below public void addGraphData(GraphData... _graphData) { } And that GraphData is nothing but POJO with getters and setters. Why is the .class file displaying GraphData... _graphData instead of GraphData _graphData ?? 回答1: It's varargs and can only be used last in a parameter list. The last param can hold more than one object. public class C { int i; String[] s; public C(int i,

问题 Good day, I have two classes, Map and Field, in the same directory. I successfully compiled Field.java but when i compile Map.java, i get this: Map.java:4: error: cannot find symbol private Field[][] gameMap; ^ symbol: class Field location: class Map Map.java:61: error: cannot find symbol public Field getFieldPosition(){ ^ symbol: class Field location: class Map Map.java:8: error: cannot find symbol gameMap = new Field[10][20]; ^ symbol: class Field location: class Map 3 errors Here are the