class

Is there a limit on the number of lines of code you can put in an Eclipse java doument

由 十年热恋 提交于 2020-01-01 05:26:10
问题 I have a project I have been working on and all was going well until today. I have close to 6000 lines of code in one java class document. If I try to put one more IF clause into the code, the program throws an exception when the class is called on. All additional snippets that I have tried to place into the class, cause the class to fail when called on. I have tried to add test code that I know works fine, and they all throw the force close alert dialog. Trust me there is nothing wrong with

Best way to create generic/method consistency for sort.data.frame?

由 纵饮孤独 提交于 2020-01-01 04:55:26
问题 I've finally decided to put the sort.data.frame method that's floating around the internet into an R package. It just gets requested too much to be left to an ad hoc method of distribution. However, it's written with arguments that make it incompatible with the generic sort function: sort(x,decreasing,...) sort.data.frame(form,dat) If I change sort.data.frame to take decreasing as an argument as in sort.data.frame(form,decreasing,dat) and discard decreasing, then it loses its simplicity

Jquery select clicked element within a set of elements with the same classname

由 a 夏天 提交于 2020-01-01 04:37:09
问题 Maybe you guys can help me out with this, I've been struggling with it for the past 30 minutes. Let's say I have four elements with the same class. <div class="test">hi</div> <div class="test">hey</div> <div class="test">yo</div> <div class="test">What's up</div> How can I select the one that was clicked on? I was able to get it work like this: $('.test').click(function() { $(this).toggleClass("btn-danger btn-success"); }); However, I need it to fire without being clicked on success after an

Can we use 'this' pointer inside constructor [duplicate]

由 |▌冷眼眸甩不掉的悲伤 提交于 2020-01-01 04:24:25
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: C++ using this pointer in constructors Like the title, may I do something like the following code? class A; class B { public: B(A* p); ... }; class A { B m; public: A():m(this){} ~A(){} }; 回答1: Yes, you can passed a pointer to an object currently under construction. But you have to keep in mind, that the object isn't constructed completely yet. So basically what B can do in it's c'tor is store the pointer for

What is the difference between a constructer and initializer in python? [duplicate]

由 喜欢而已 提交于 2020-01-01 04:17:16
问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Python (and Python C API): new versus init I'm at college just now and the lecturer was using the terms constructors and initializers interchangeably. I'm pretty sure that this is wrong though. I've tried googling the answer but not found the answer I'm looking for. 回答1: In most OO languages, they are the same step, so he's not wrong for things like java, c++, etc. In python they are done in two steps: __new__

Is it possible to implement events in C++?

由 拟墨画扇 提交于 2020-01-01 04:14:47
问题 I wanted to implement a C# event in C++ just to see if I could do it. I got stuck, I know the bottom is wrong but what I realize my biggest problem is... How do I overload the () operator to be whatever is in T , in this case int func(float) ? I can't? Can I? Can I implement a good alternative? #include <deque> using namespace std; typedef int(*MyFunc)(float); template<class T> class MyEvent { deque<T> ls; public: MyEvent& operator +=(T t) { ls.push_back(t); return *this; } }; static int test

Unable to use 'class' as a key in NSDictionary

由 心不动则不痛 提交于 2020-01-01 04:11:07
问题 I'm trying to use a class as a key in an NSDictionary . I looked at the answer to this question and what I have is pretty much the same; I'm using setObject: forKey: . However, XCode complains, saying Incompatible pointer types sending 'Class' to parameter of type 'id<NSCopying>' . The call I have is: [_bugTypeToSerializerDictionary setObject: bugToStringSerializer forKey: [bugToStringSerializer serializedObjectType]]; bugToStringSerializer is an instance of BugToStringSerializer whose

java中Class.getResource用法（用于配置文件的读取）

由 做~自己de王妃 提交于 2020-01-01 04:01:31
　　用JAVA获取文件，听似简单，但对于很多像我这样的新人来说，还是掌握颇浅，用起来感觉颇深，大常最经常用的，就是用JAVA的File类，如要取得c:/test.txt文件，就会这样用File file = new File("c:/test.txt");这样用有什么问题，相信大家都知道，就是路径硬编码，对于JAVA精神来说，应用应该一次成型，到处可用，并且从现实应用来讲，最终生成的应用也会部署到Windows外的操作系统中，对于linux来说，在应用中用了c:/这样的字样，就是失败，所以，我们应该尽量避免使用硬编码，即直接使用绝对路径。 　　在Servlet应用中，有一个getRealPath(String str)的方法，这个方法尽管也可以动态地获得文件的路径，不秘直接手写绝对路径，但这也是一个不被建议使用的方法，那么，我们有什么方法可以更好地获得文件呢? 那就是Class.getResource()与Class.getResourceAsStream()方法，但很多人还是不太懂它的用法，因为很多人（比如不久前的我）都不知道应该传怎么样的参数给它，当然，有些人己经用得如火纯青，这些人是不需要照顾的，在此仅给不会或者还不是很熟的人解释一点点。 比如我们有以下目录 |--project |--src |--javaapplication |--Test.java |--file1

Class.getResource和ClassLoader.getResource的区别分析

由 佐手、 提交于 2020-01-01 03:59:37
Class.getResource(String path) path不以'/'开头时，默认是从此类所在的包下取资源；path以'/'开头时，则是从项目的ClassPath根下获取资源。在这里'/'表示ClassPath JDK设置这样的规则，是很好理解的，path不以'/'开头时，我们就能获取与当前类所在的路径相同的资源文件，而以'/'开头时可以获取ClassPath根下任意路径的资源。 如下所示的例子： 1 2 3 4 5 6 7 8 public class Test { public static void main ( String [ ] args ) { System . out . println ( Test . class . getResource ( "" ) ) ; System . out . println ( Test . class . getResource ( "/" ) ) ; } } 运行结果为： file:/D:/work_space/java/bin/net/swiftlet/ file:/D:/work_space/java/bin/ Class.getClassLoader().getResource(String path) path不能以'/'开头时，path是指类加载器的加载范围，在资源加载的过程中

OOP in PHP: Class-function from a variable?

由 亡梦爱人 提交于 2020-01-01 03:52:05
问题 Is it possible to call functions from class like this: $class = new class; $function_name = "do_the_thing"; $req = $class->$function_name(); Something similar solution, this doesn't seem to work? 回答1: Yes, it is possible, that is know as variable functions , have a look at this. Example from PHP's official site: <?php class Foo { function Variable() { $name = 'Bar'; $this->$name(); // This calls the Bar() method } function Bar() { echo "This is Bar"; } } $foo = new Foo(); $funcname =
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