类级字符串常量与方法级字符串常量之间有什么显着差异吗？编译器会识别常量并应用常量折叠吗？或者总是会创建 nw 对象？
这是示例：类级常量
class A
{
private const string Sid = "sid";
private const string Pid = "pid";
public void Do()
{
Console.WriteLine(Sid);
Console.WriteLine(Pid);
}
}
方法级常量：
class B
{
public void Do()
{
const string Sid = "sid";
const string Pid = "pid";
Console.WriteLine(Sid);
Console.WriteLine(Pid);
}
}
VBScript中的此类代码将返回错误的结果：
MsgBox Round(4.99985,4)
它将返回，4.9998但正确的结果是4.9999。我知道这与VBScript如何使用带浮点数的数字有关，有些数字无法用二进制表示，但是请告诉我：
谢谢！
如何使用JavaScript的radconfirm？函数radalert或radconfirm未定义.有人可以给我看样品吗？
例如,当我调用此函数时,我得到radalert是未定义的:
function testWnd() {
radalert("Confirm returned the following result: " + arg);
}
在我的一个自动化测试中,我需要在文本框中按Ctrl+ V以在其中粘贴文本.但我不能这样做.我正在使用Selenium WebDriver for .net v.2.35.0.0.这是我的代码,它不起作用.Ctrl然后按,然后V,文本不会粘贴在框中:
IWebDriver webDriver = new InternetExplorerDriver();
webDriver.Navigate().GoToUrl(@"C:\Users\us\Documents\Visual Studio 2012\Projects\SeleniumTests\SeleniumTests\test.html");
var el = webDriver.FindElement(By.XPath(".//*[@id='fld']"));
el.Click();
Actions builder = new Actions(webDriver);
builder.KeyDown(el, Keys.LeftControl).Perform();
builder.SendKeys(el, "v").Perform();
builder.KeyUp(el, Keys.LeftControl).Perform();
webDriver.Quit();
更新: 操作系统:Windows Server 2012,x64浏览器:IE10
我被问到一个问题(在这个网站http://scjptest.com/上):在这行代码示例中有多少对象符合垃圾收集的条件//某些代码在这里？
class A {
private B b;
public A() {
this.b = new B(this);
}
}
class B {
private A a;
public B(A a) {
this.a = a;
}
}
public class Test {
public static void main(String args[]) {
A aa = new A();
aa = null;
// some code goes here
}
}
正确答案是:"a和b引用的对象有资格进行垃圾回收." 但为什么？它们包含彼此的循环引用,它们可以相互访问.
谢谢!
我今天在QTP 11中发现了奇怪的行为:表达式
Browser().Page().WebElement("PositionManagerContainer").WebElement("LoadingMessage").Object.ParentNode.ParentNode
给出错误:对象必需".Object.ParentNode"
但表达
Browser().Page().WebElement("PositionManagerContainer").WebElement("LoadingMessage").Object.parentNode.ParentNode
(.Object的ParentNode成员的情况不同)是正确的,没有任何错误正常工作.
浏览器是Firefox.在IE中它工作得很好.
有人能解释为什么会这样吗？只是为了兴趣.
有没有办法在visual studio扩展中订阅Test Explorer事件？我没有在DTE2界面中找到类似的东西.我的目标是在测试运行完成时从扩展触发一些功能(对于从Test Explorer运行的测试)
谢谢!
我从网站（http://dev.splunk.com/sdks）下载了Splunk Java SDK，并尝试在jdk1.8.0_91（Windows 10）下运行它。但是我越来越例外了。我该如何运作？
"C:\Program Files\Java\jdk1.8.0_91\bin\java" -Didea.launcher.port=7537 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.1.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_91\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\rt.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\out\production\examples;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\out\production\splunk;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\gson-2.2.4.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\opencsv-2.3.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-explorer.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-util.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-nodes.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-util-lookup.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-awt.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-dialogs.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-actions.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\org-openide-filesystems.jar;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\out\production\util;C:\Users\vitalii\Downloads\splunk-sdk-java-1.5.0\lib\commons-cli-1.2.jar;C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.1.3\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.splunk.examples.search.Program "index=alpo-dev 12345"
java.lang.RuntimeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
at com.splunk.HttpService.send(HttpService.java:409)
at com.splunk.Service.send(Service.java:1293)
at com.splunk.HttpService.post(HttpService.java:308)
at com.splunk.Service.login(Service.java:1122)
at com.splunk.Service.login(Service.java:1101)
at com.splunk.Service.connect(Service.java:187)
at com.splunk.examples.search.Program.run(Program.java:117)
at com.splunk.examples.search.Program.main(Program.java:54) …我有这样的单例类:
package ua.org.bytes.ewt;
import org.apache.struts2.ServletActionContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import ua.org.bytes.ewt.dao.CategoriesManager;
import ua.org.bytes.ewt.dao.ShortcutsManager;
/**
*
* @author Vitaliy Ganzha
*/
public class ApplicationSupervisor {
private static final ApplicationSupervisor INSTANCE = new ApplicationSupervisor();
private CategoriesManager categoriesManager;
public void setCategoriesManager(CategoriesManager categoriesManager) {
this.categoriesManager = categoriesManager;
}
public void setShortcutsManager(ShortcutsManager shortcutsManager) {
this.shortcutsManager = shortcutsManager;
}
private ShortcutsManager shortcutsManager;
public ShortcutsManager getShortcutsManager() {
return shortcutsManager;
}
private ApplicationSupervisor(){
/*WebApplicationContext context =
WebApplicationContextUtils.getRequiredWebApplicationContext(
ServletActionContext.getServletContext()
);
categoriesManager = (CategoriesManager)context.getBean("categoriesManager");
shortcutsManager = (ShortcutsManager)context.getBean("categoriesManager");*/
}
public static …有什么方法可以访问 Android 的 WebView 中的 DOM 结构吗？我需要它来检查页面上是否存在某个 DOM 对象，然后触发一些事件。
谢谢！