如何解决我的代码中为NullPointerException怎么处理
您会看到一个NullPointerException
原因,因为main()
您从一开始就尝试访问该loginApplication()
方法,这需要in的活动实例,WebDriver
即driver
tofindElement(By.name("username"));
&findElement(By.name("password"));
and
perform sendKeys()
方法HTML DOM
。
解决方案是先访问该launchApplication()
方法,以便您拥有driver
and 的活动实例IE
Browser
。接下来,您可以访问loginApplication()
方法。
这是您的工作代码块:
package demo;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;
public class Q45474353_NPE
{
public WebDriver driver;
public void launchApplication()
{
System.setProperty("webdriver.ie.driver", "C:\\Utility\\BrowserDrivers\\IEDriverServer.exe");
driver = new InternetExplorerDriver();
driver.get("https://www.gcrit.com/build3/admin/");
}
public void loginApplication(String Username, String Password)
{
driver.findElement(By.name("username")).sendKeys(Username);
driver.findElement(By.name("password")).sendKeys(Password);
driver.findElement(By.id("tbd1")).click();
}
public void closeBrowser()
{
driver.close();
}
public static void main(String[] args)
{
Q45474353_NPE obj = new Q45474353_NPE();
obj.launchApplication();
obj.loginApplication("admin", "admin@123");
obj.closeBrowser();
}
}
解决方法
我已经使用Selenium用Java编写了代码。当我运行代码时,它将引发NullPointerException。检查以下异常
Exception in thread "main" java.lang.NullPointerException
at AdminInterface.loginApplication(AdminInterface.java:17)
at AdminInterface.main(AdminInterface.java:29)
我的代码如下:
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;
public class AdminInterface {
public WebDriver driver;
public void launchApplication() throws Exception
{
System.setProperty("webdriver.ie.driver","C:\\Users\\rprem\\Downloads\\IEDriverServer_x64_3.4.0\\IEDriverServer.exe");
driver = new InternetExplorerDriver();
driver.get("https://www.gcrit.com/build3/admin/");
}
public void loginApplication(String Username,String Password)
{
driver.findElement(By.name("username")).sendKeys(Username);
driver.findElement(By.name("password")).sendKeys(Password);
driver.findElement(By.id("tbd1")).click();
}
public void closeBrowser()
{
driver.close();
}
public static void main(String[] args)
{
AdminInterface obj = new AdminInterface();
obj.loginApplication("admin","admin@123");
}
}