class | 易学教程

Find all classes in package (& call static methods) at runtime

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问题 I have a package in which there are many classes, and these classes all have a static method called onLoad . I want to call the onLoad method when the program starts, however I do not want to hard-wire each and every one, i.e. classA.onLoad(); classB.onLoad(); etc. How can I list all classes in package com.foo.bar.asd and run onLoad() on all of them? Thanks in advance 回答1: I found this question quite interesting so I came up with a solution. The tricky part here is to actually find all

for loop getting converted to do while loop in compiled class file

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问题 In my team we are using java 1.4.2 Most of the machine for loop is getting compiled as for only.ie. if i decompile the class file I can get see for loop only but certain machines of certain developer's it becomes do while loop. ie when i decompile certain classes it becomes do while How can it happen? Any possible reason, java version or configuration any body can think so i can reproduce this defect and fix it in all developers machines 回答1: I would not call this a defect. When you compile

前端报错：Cannot read property 'name' of null

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问题挺简单的，但是自己愣是花了一段时间才搞出来问题的起因，好菜啊。 *好好的看看问题所在，在去找错，不然会很费时间。解决：数据库有一条为空的数据，前端没有做封装，无法读取为null的数据。报错，前台加判断，或者数据库改改，前者好吧 page_base_decidedzone.action: 93 Uncaught TypeError : Cannot read property 'name' of null at Object .formatter (page_base_decidedzone.action: 93 ) at Object .renderRow (jquery.easyui.min.js: 8354 ) at Object .render (jquery.easyui.min.js: 8293 ) at _4e5 (jquery.easyui.min.js: 7318 ) at jquery.easyui.min.js: 7861 at Object .success (jquery.easyui.min.js: 8472 ) at fire (jquery -1.8 .3 .js: 974 ) at Object .fireWith [ as resolveWith] (jquery -1.8 .3 .js: 1084 ) at done (jquery -1

runze -review class

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class hero : def run ( self ) : print ( 'run' ) # 子类 class youxia ( hero ) : def __init__ ( self , name ) : self . name = name self . youxia = "shopping" self . life = 5 self . dun = 5 self . bullet = 180 def fangun ( self ) : print ( 'fangun' ) # 类 class qishi ( ) : def __init__ ( self , name ) : self . name = name self . life = 5 self . dun = 5 self . bullet = 180 def shuangchi ( self ) : print ( 'shuangchi' ) # 类 class fashi ( hero , qishi ) : def __init__ ( self , name ) : self . name = name self . life = 5 self . dun = 5 def buling ( self ) : print ( 'buling' ) def run ( self ) : print (

Use existing classes in prestashop module

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问题 I am preparing a custom module for prestashop. I want to use in it some classes that exist in prestashop already (Orderdetail.php). How can I do this? Is the code below sufficient or do I need to include something else in addition? $order = new OrderDetail; 回答1: Yes, the native classes can be called like that. $order_detail = new OrderDetail(); However to use custom classes you need to include their files in the script you want to use them. include_once 'path_to_custom_class_file'; class

无缝轮播图

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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>轮播图</title> <style> *{ margin: 0; padding: 0; } #banner{ position: relative; width:400px; height:300px; } #show{ width:400px; height:300px; border:2px solid #f00; overflow:hidden; } #con{ width:1600px; height:300px; } img{ width:400px; height:300px; } #btn{ list-style-type:none; position:absolute; left:50%; top:270px; } #btn li{ float:left; width:15px; height:15px; font-size:12px; text-align:center; background:#fff; border-radius:50%; margin-left:5px; cursor: pointer; } #btn .bg{ background:#000; color:#fff; } .eds-page-ioc{

Java 反射调用运行时类对象等等

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@Test public void test2 ( ) throws Exception , InstantiationException { //获取当前Class /** * //获取 Class 的几种方式 * Class<Person> clazz1 = Person.class; * System.out.println(clazz1); * * Person p1 = new Person(); * Class clazz2 = p1.getClass(); * Class clazz3 = Class.forName("com.study.refilex.Person"); */ Class clazz = Person . class ; //创建当前运行时类对象 Person person = ( Person ) clazz . newInstance ( ) ; //获取当前运行时类的属性 Field name = clazz . getDeclaredField ( "name" ) ; //保证当前属性是可以访问的 name . setAccessible ( true ) ; //设置当前运行时类对象的属性的值 name . set ( person , "xingming" ) ; //获取此对象的值 System . out . println (

JavaScript Decorator on Class constructor

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问题 I'm trying to add some properties in class instances (like a Plugin system). For that, I followed this example to do that with a Class Decorator: function testDecorator(target:any) { // save a reference to the original constructor var original = target; // the new constructor behaviour var f : any = function (...args: any[]) { console.log("New: " + original.name); return original.apply(this, args) } // copy prototype so intanceof operator still works f.prototype = original.prototype; //

push_back with derived class

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问题 I want to create an array of objects and I want to use a certain constructor. std::vector<Modul> arrDigOut; arrDigOut.push_back(Modul(IDC_CHECK1, this, "GVL.DigOut1", pAddr)); This works as long as DigOut is not a derived class. When I derive it and use the class DigOut it fails: class Modul { protected: int id; int nErr; void* plcVar; bool bDigOut; PAmsAddr pAddr; ULONG lHdlVar; CButton* pBt; public: Modul(); //Modul(int ID, Cbeckhoff_frontendDlg* pCbeckhoff,void* pVar,PAmsAddr pAdr) //{ //

push_back with derived class

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