我写了一个代码来验证给定的文本是否存在于该行中，但我如何在特定的单元格中单击？请帮助我。
下面是我为验证文本而写的代码。

package com.Tables;

import java.util.List;

public class HandlingTables {

public static void main(String[] args) throws InterruptedException {
    String s="";
    System.setProperty("webdriver.chrome.driver", "D:/chromedriver.exe");
    WebDriver driver = new ChromeDriver();
    driver.get("http://www.w3schools.com/html/html_tables.asp");
    WebElement table = driver.findElement(By.className("w3-table-all"));
    List<WebElement> allrows = table.findElements(By.tagName("tr"));
    List<WebElement> allcols = table.findElements(By.tagName("td"));
    System.out.println("Number of rows in the table "+allrows.size());
    System.out.println("Number of columns in the table "+allcols.size());

    for(WebElement row: allrows){
        List<WebElement> Cells = row.findElements(By.tagName("td"));
        for(WebElement Cell:Cells){
            s = s.concat(Cell.getText());   
        }
    }
    System.out.println(s);
    if(s.contains("Jackson")){
        System.out.println("Jackson is present in the table");
    }else{
        System.out.println("Jackson is not available in the table");
    }
    Thread.sleep(10000);
    driver.quit();
  }
}