问题列表 - 第44872页

CSS中#FFF(#FFFFFF)和"white"之间有区别吗？这个比那个好吗？

嗨我有一个使用结构的链表.现在我得到它在最后添加每个元素.但是,我想根据ID按排序顺序添加每个元素.该结构有两个元素:字符串名称和长ID.

node* temp = new node;
temp->name = nameRead;
temp->id = idRead;

//check if first item, if so add as head
if(head == NULL)
{
    head = temp;
}
else
{
   node* temp2 = head;
   while(temp2->next != NULL)
   {
      temp2 = temp2->next;
   }
   temp2->next = temp;
}

我怎么能合并两个哈希值,导致没有新的键,这意味着合并会合并两个哈希中存在的键？

例如,我想要以下内容:

h = {:foo => "bar"}
j = {:foo => "baz", :extra => "value"}

puts h.merge(j)    # {:foo => "baz"}

我正在寻找一种非常干净的方式,因为我当前的实现非常混乱.

HI,

在我们的Web应用程序中,它打印所有日志,如Spring和JSF jars文件.这对我们来说不是必需的.如何在log4j.xml文件中设置仅针对我们的应用程序进行过滤？

更新

以下是我们用于日志记录的配置.你能告诉我它是否正确吗？我必须在文件中添加logger元素？

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<!-- Log4j Configuration file to log the messages into different logfiles -->
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

  <appender name="DEBUG" class="org.apache.log4j.RollingFileAppender">
    <param name="File" value="D:/logs/DEBUGFILE.log"/>
     <param name="Append" value="true"/>
     <param name="MaxFileSize" value="500KB"/>
     <param name="MaxBackupIndex" value="2"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%d [%t] %p - %m%n"/>
    </layout>
    <filter class="org.apache.log4j.varia.LevelRangeFilter">
     <param name="LevelMin" value="DEBUG" />
      <param name="LevelMax" value="DEBUG" />
    </filter>
  </appender>

  <appender name="INFO" class="org.apache.log4j.RollingFileAppender">
    <param name="File" value="D:/logs/AUDIT_TRAIL.log"/>
    <param name="Append" value="true"/>
     <param name="MaxFileSize" value="500KB"/>
     <param name="MaxBackupIndex" value="2"/>
    <layout …

如果我@Immutable在实体上使用注释并在注释上添加updatable属性insertable，@Column这会是多余的吗？

@实体
@不可变
公共类 SomeEntity...
{
 @Column（名称=“xyz”可更新= false，可插入= false）
 私有字符串 xyz；
 ...
}

来自.Net Hosting(Flexible Medium Trust)的评论说.

Godaddy是中等信任,这意味着你不能使用IL发射之类的东西(Nhibernate需要这个用于代理)

这是真的吗？有人在GoDaddy上使用NHibernate吗？

我目前正在学习Perl编程,并且正在运行这样的语句:

return bless { }, $type;

I know what return bless { }; would do, and I also know what return $type; would do, but how does separating them by a comma affect the statement, and does it work the same way for all unary operators?

How can I write a function in Python that rounds a number, in the usual fashion. Numbers less than .5 round down, and .5 and above rounds up.

3.4 -> 3

11.9 -> 12

5.5 -> 6

I've written following code to get the content from a web page and save to the system. if the webpage is in html format i'm able to save it. if the web page is in pdf format i'm unable to save it. After saving if i opend the file blank pages are coming.

我想知道如何从响应中保存pdf文件.

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(Url);
WebResponse response = request.GetResponse();
Stream stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream);
webContent = reader.ReadToEnd();
StreamWriter sw = new StreamWriter(FileName);
sw.WriteLine(webContent); …

我有一些代码

case class A(s:String) {val x = "hello"}

为什么我不能在x没有实例化A类的情况下访问静态变量？如果我输入

A.x

我收到以下错误:

error: value x is not a member of object A

编辑:

我错过了提到剩下的代码.这是我想要使用的示例:

abstract class A { val name:String }
case class B(i:Int) extends A { val name = "B" }
case class C(b:Boolean) extends A { val name = "C" }
def getType(s:String) = s match {
  case B.name => println ("Object B")
  case C.name => println ("Object C")
}

错误:

  scala> def getType(s:String) = s match …