I wrote my own class loader. I need all my classes to be loaded using my class loader. I have passed the VM the following: -Djava.system.class.loader=MyClassLoader Only the first referenced class in my package is being loaded using my class loader. Other classes in my package are being loaded using AppClassLoader . Here is what MyClassLoader looks like: import java.io.IOException; import
我写了我自己的类加载器。 我需要使用我的类加载器来加载所有的类。 我已经通过VM了以下内容: -Djava.system.class.loader=MyClassLoader 我的包中只有第一个被引用的类正在使用我的类加载器加载。 我的包中的其他类正在使用AppClassLoader加载。 以下是MyClassLoader外观: import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.util.Enumeration; public class MyClassLoader
I personally like the exclusive or, ^ , operator when it makes sense in the context of boolean checks because of its conciseness. I much prefer to write if (boolean1 ^ boolean2) { //do it } than if((boolean1 && !boolean2) || (boolean2 && !boolean1)) { //do it } but I often get confused looks from other experienced Java developers (not just the newbies), and sometimes comm
我个人喜欢独占或^ ,操作符,因为它的简洁性在布尔检查的上下文中是有意义的。 我更喜欢写作 if (boolean1 ^ boolean2) { //do it } 比 if((boolean1 && !boolean2) || (boolean2 && !boolean1)) { //do it } 但是我经常会从其他有经验的Java开发人员(不仅仅是新手)中感到困惑,有时还会评论它应该如何才能用于按位操作。 我对使用^运算符的最佳实践感到好奇。 你可以简单地使用!=来代替。 我认
In Java, Class has an isAssignableFrom method defined as follows: public boolean isAssignableFrom(Class<?> cls) Determines if the class or interface represented by this Class object is either the same as, or is a superclass or superinterface of, the class or interface represented by the specified Class parameter. It returns true if so; otherwise it returns false . If this Class object
在Java中, Class有一个isAssignableFrom方法,定义如下: public boolean isAssignableFrom(Class<?> cls) 确定此Class对象表示的类或接口是否与指定的Class参数表示的类或接口相同,或者是否为超类或超接口。 如果是的话,它返回true ; 否则返回false 。 如果此Class对象表示基本类型,则此方法返回true如果指定的Class参数恰好是此Class对象; 否则返回false 。 具体来说,此方法测试指定Class参数表示的类型是
I have a server that accept more then one Client. Every Client is stored inside an ArrayList of Sockets. If a Client, for some reason, disconnects from my server, this should understand which client has been disconnected, close the client and delete it from the List. Reading other question here I have understood that the only way to understand which client is disconnected is this: try to send
我有一个接受多个客户端的服务器。 每个客户端都存储在套接字的ArrayList中。 如果某个客户端出于某种原因与我的服务器断开连接,则应该了解哪个客户端已断开连接,关闭客户端并将其从列表中删除。 在这里阅读其他问题我已经理解了,理解哪个客户端断开连接的唯一方法是:尝试通过连接的所有套接字发送数据,并且抛出异常的第一个必须关闭。 问题是,如果客户端是一个简单的Java应用程序,它完美的作品。 但是,当客户端是
Hey all. I have a server written in java using the ServerSocket and Socket classes. I want to be able to detect and handle disconnects, and then reconnect a new client if necessary. What is the proper procedure to detect client disconnections, close the socket, and then accept new clients? Presumably, you're reading from the socket, perhaps using a wrapper over the input stream, such a
大家好。 我有一个使用ServerSocket和Socket类以java编写的服务器。 我希望能够检测并处理断开连接,并在必要时重新连接新客户端。 检测客户端断开连接,关闭套接字,然后接受新客户端的正确过程是什么? 据推测,你正在从套接字读取,也许使用输入流的包装,如BufferedReader。 在这种情况下,当相应的读取操作返回-1(对于raw read()调用)或null(对于readLine()调用)时,您可以检测到流结束。 某些操作在封闭
I'm trying to implement Negamax search for a game called Nine Men's Morris in Java. If a player has three pieces in a row (here called a mill), he removes a opponent's piece (the 'additional' move) before switching turns. Additionally, there is a set piece phase and a move piece phase, after all initial pieces have been placed. My implementation looks like this: public
我正在尝试使用Negamax在Java中搜索名为Nine Men's Morris的游戏。 如果一个玩家连续有三个棋子(这里称为磨坊),他在切换转牌圈之前移除一个对手的棋子('额外'移动)。 此外,在所有最初的棋子被放置之后,还有一个棋子阶段和一个棋子阶段。 我的实现如下所示: public int[] negamaxSet(int depth, int alpha, int beta, int color) { if (depth == 0 || board.isGameOver()) { return new in
I'm trying to implement the data mapper pattern for a User Class. If I understood correctly, the business class User shouldn't call any persistence methods, instead, it's dropped into the Data Mapper class (UserMapper) and the mapper interfaces with the database, ideally using a table gateway class. I have some questions: Where would I put a checkLogin method? User or UserMappe
我试图为用户类实现数据映射器模式。 如果我理解正确,业务类User不应调用任何持久性方法,而应将其放入Data Mapper类(UserMapper)中,并且映射器与数据库接口,理想情况下使用表网关类。 我有一些疑问: 我会在哪里放一个checkLogin方法? 用户或UserMapper? 我需要通过他的cookie来检查当前访问者的登录状态。 由于用户不能引用数据库和会话数据存储在那里,我必须使用映射器类吗? 我在哪里放置验证规则? 我
I have to implement a simple tour client-server game in Java. Unfortunately, I'm just beginning with network programming and have some problems with choosing an apropriate solution. Let's assume I'm creating a chess game where two clients can connect to the server, authenticate with their username and passwords and play. The clients must be programmed as applets (thin clients), bu
我必须用Java实现一个简单的游览客户端 - 服务器游戏。 不幸的是,我刚刚开始使用网络编程,并在选择适当的解决方案时遇到了一些问题。 假设我正在创建一个国际象棋游戏,其中两个客户端可以连接到服务器,使用用户名和密码进行身份验证并进行游戏。 客户端必须被编程为applet(瘦客户端),但我不知道我应该用作服务器。 我的意思是,我已经阅读了几种不同的可能性,例如RMI,套接字,servlet,但仍然不知道哪一个符合我
I am using Play's war command to package up my application into a WAR file for deployment, like so: play war mydir -o myapp --zip (Discovering --zip has sure saved me a lot of time!) This command creates a WAR file myapp.war just like it's supposed to, and also an exploded version of the WAR in a directory myapp/ . I've changed the names of my directories to avoid confusion, but
我使用Play的war命令将我的应用程序打包成WAR文件进行部署,如下所示: play war mydir -o myapp --zip (发现--zip确实为我节省了很多时间!)这个命令就像它应该创建的WAR文件myapp.war一样,也是在目录myapp/中的WAR的分解版本。 为了避免混淆,我更改了目录的名称,但通常我想让WAR文件与我的应用程序目录(在本例中为mydir )具有相同的名称。 play war mydir -o mydir --zip当然失败了,而不是覆盖我的app目录,这
This question already has an answer here: How to check whether a checkbox is checked in jQuery? 56 answers Try with: if($('#primayins').prop('checked')) ... Alternatively: if($('#checkbox').is(':checked')) ...
这个问题在这里已经有了答案: 如何检查复选框是否在jQuery中被选中? 56个答案 尝试: if($('#primayins').prop('checked')) ... 或者: if($('#checkbox').is(':checked')) ...