硒WD | 如何将所有值从WebElement列表复制到字符串列表？

Question

I have a list that I collecting a list of stock prices that are constantly changing

List listOfLastPrice1;

I know that this list is not constant as the price of stocks is not constant. Meaning if I print it now, and will print it again in 5 minutes, values would change. Why? because this is a WebElement list that is connected to the DOM directly.

I have created a second list

ArrayList listCopyLastPrice1 = new ArrayList();

I would like to copy all values from the WebElement list, into the String list. How do I do that?

I tried several attempts but with no success

package TestMain;

import java.util.ArrayList;
import java.util.List;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

import PageObjects.Editions;

public class Test {

public void getList(WebDriver driver) {



driver.get("https:www.investing.com/Markets");
List <WebElement> listOfLastPrice1;
listOfLastPrice1= driver.findElements(By.cssSelector("[data-column-name='last'][class*='pid']")); 

ArrayList<String> listCopyLastPrice1 = new ArrayList<String>();

//..........

}

}

Answer 1

Iterate over WebElement list and add values to String list

List <WebElement> listOfLastPrice1;
listOfLastPrice1= driver.findElements(By.cssSelector("[data-column-name='last'][class*='pid']")); 

List<String> listCopyLastPrice1 = new ArrayList<String>();

for (WebElement element : listOfLastPrice1) {
    listCopyLastPrice1.add(element.getText());
}

EDIT:

Since Java 1.8 you can use Stream API to change the list of WebElement s to list of String like this:

List<String> listOfLastPrice1WithStrings = driver.findElements(By.cssSelector("[data-column-name='last'][class*='pid']"))
    .stream() 
    .map(x -> x.getText())
    .collect(Collectors.toList());

Answer 2

No , you can't copy a List of WebElement within a List of String type. Attempting that will raise ClassCastException . But you can store any of the attributes of the WebElements (eg id, name, innerText, innerHTML) within the String type List as follows :

List<String> listCopyLastPrice1 = new ArrayList<String>();
List<WebElement> listOfLastPrice1 = driver.findElements(By.cssSelector("[data-column-name='last'][class*='pid']"));
for(WebElement elem:listOfLastPrice1)
    listCopyLastPrice1.add(elem.getAttribute("innerHTML"));
System.out.println(listCopyLastPrice1);