我试图设置Selenium Webdriver与Java的Browserstack一起使用，以进行自动测试。我安装了Selenium for
Java，然后从浏览器堆栈的站点https://www.browserstack.com/automate/java#configure-
capabilities复制并粘贴了代码，以建立示例自动化测试。

我javac -classpath selenium-server-standalone-2.48.2.jar JavaSample.java从终端运行（JavaSample.java是带有selenium配置代码和示例测试的文件），并且出现以下错误：

JavaSample.java:1: error: package org.openqa.selenium does not exist
import org.openqa.selenium.By;
                      ^
JavaSample.java:2: error: package org.openqa.selenium does not exist
import org.openqa.selenium.Platform;
                      ^
JavaSample.java:3: error: package org.openqa.selenium does not exist
import org.openqa.selenium.WebDriver;
                      ^
JavaSample.java:4: error: package org.openqa.selenium does not exist
import org.openqa.selenium.WebElement;
                      ^
JavaSample.java:5: error: package org.openqa.selenium.remote does not exist
import org.openqa.selenium.remote.DesiredCapabilities;
                             ^
JavaSample.java:6: error: package org.openqa.selenium.remote does not exist
import org.openqa.selenium.remote.RemoteWebDriver;
                             ^
JavaSample.java:18: error: cannot find symbol
DesiredCapabilities caps = new DesiredCapabilities();
^
symbol:   class DesiredCapabilities
location: class JavaSample
JavaSample.java:18: error: cannot find symbol
DesiredCapabilities caps = new DesiredCapabilities();
                               ^
symbol:   class DesiredCapabilities
location: class JavaSample
JavaSample.java:25: error: cannot find symbol
WebDriver driver = new RemoteWebDriver(new URL(URL), caps);
^
symbol:   class WebDriver
location: class JavaSample
JavaSample.java:25: error: cannot find symbol
WebDriver driver = new RemoteWebDriver(new URL(URL), caps);
                       ^
symbol:   class RemoteWebDriver
location: class JavaSample
JavaSample.java:27: error: cannot find symbol
WebElement element = driver.findElement(By.name("q"));
^
symbol:   class WebElement
location: class JavaSample
JavaSample.java:27: error: cannot find symbol
WebElement element = driver.findElement(By.name("q"));
                                        ^
symbol:   variable By
location: class JavaSample

我不确定如何解决这个问题，因为我只是按照Browserstack上的说明进行操作，而且我对Java的了解很少。