Java：Selenium：WebDriver：无法解析列表 <WebElement> 宾语; 获取错误“无法转换为java.lang.String”

Question

I am new to java programming and I have a question on parsing a List<WebElement> object. I have a selenium webdriver script (written in java) that parses through a List<WebElement> object. Code Snippet of working code is below.

// Create a List composed of objects from the Client_Totals table
List<WebElement> tdlist = driver.findElements(By.cssSelector("table[class='client_totals'] tr td"));        // 8-12-13 -- This Code Works -- KV

for(WebElement el: tdlist)
    {
    System.out.println(el.getText());
    }

This code works but I need to modify the script so that the script:

1. checks for the following values:
   • (a) 11 - 25 User Discount
   • (b) $17.55 (c) $4829.40
2. Outputs messages that inform user if the values were successfully located or not.

I began to write a new modified script (see below) using an iterator to loop through the tdlist but I am getting the following error: java.lang.ClassCastException: org.openqa.selenium.remote.RemoteWebElement cannot be cast to java.lang.String

// Create a List composed of objects from the Client_Totals table
List<WebElement> tdlist = driver.findElements(By.cssSelector("table[class='client_totals'] tr td"));
Iterator itr = tdlist.iterator();                                                                         
while(itr.hasNext())
    {
    String value= (String)itr.next();
    System.out.println("Value : "+value);
    }

My Assessment: I think the error occurs because the tdlist is of a different type and, to work, the tdlist needs to be "cast" as a string array. However, I am not sure how to do this.

Next, I also need to add nested IF ELSE statements in the while structure. I've written pseudo code on what I think the appropriate code structure might look like:

While there are elements in the array
    {
    Parse through the array
    If value "11 - 25 User Discount" is found
        Print message "11 - 25 User Discount was found"
    Else If value "$17.55" is found
        Print message "$17.55 was found"
    Else If value "$4829.40" is found
        Print message "$4829.40 was found"
    Else
End While Loop
}

Answer 1

Ok. Your problem is that tdList is a List<WebElement> , and WebElement cannot be cast to a String.

If you are using a compiler, you probably got a warning on the Iterator line, saying that it was generic. You need to have that line be Iterator<WebElement> iter = tdlist.iterator(); . Then you can do itr.next().getText() and you don't have to cast anything!

Answer 2

Here is my guess:

// Create a List composed of objects from the Client_Totals table
List<WebElement> tdlist = driver.findElements(By.cssSelector("selector text"));
for ( WebElement el: tdlist ) {
    System.out.println( el.getText() );
    Assert.assertTrue( el.getText().equalsIgnoreCase("a message"), 
        "There was no message."); 
    Assert.assertTrue( el.getText().equalsIgnoreCase("11 - 25 User Discount"), 
        "There was no 11 - 25 User Discount.");
    Assert.assertTrue( el.getText().equalsIgnoreCase("$17.55"), 
        "There was no $17.55.");
    Assert.assertTrue( el.getText().equalsIgnoreCase("$4829.40"), 
        "There was no $4829.40.");
}