how to test data table in selenium - selenium

Question

I want to test a data in html table.and verify it with database which contains the staff information. Below is the code. now i am stuck for creating assert, how to collect the rows or list of list of the table values
#Test
public void TestingReport()
{
driver.findElement(By.xpath(".//*[#id='content']/h2[2]/a")).click(); // click on admin
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
driver.findElement(By.xpath("//*[#id='content']/h2[2]/a")).click(); // click on staff member
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
// ArrayList<ArrayList> ActualReport= new ArrayList<ArrayList>();
List<WebElement> tablerow = driver.findElements(By.xpath("//table//tr"));
ArrayList <String> cellsStr = new ArrayList<>();
ArrayList<List> table = new ArrayList<>();
List<WebElement> cells= null ;
// System.out.println(tablerow.size());
for(int i=1;i<tablerow.size();i++) {
cells = driver.findElements(By.xpath("//tr["+i+"]//td"));
// table.add(cells);
for(int j=4;j<cells.size();j++)
{
System.out.println(cells.get(j).getText());
cellsStr.add(cells.get(j).getText());
}
System.out.println(cellsStr);
table.add(cellsStr);
System.out.println(table);
System.out.println(cellsStr);
}
System.out.println(table);
}
Here i am trying to get an Arraylist of sting in to a string, but before the next iteration i am clearing the Arraylist of string, but it is making the List of array list also empty.

Answer 1

Below helps to get the data from list of list of values.
List<WebElement> tablerow = driver.findElements(By.xpath("//table//tr"));
for(int i=1;i<tablerow.size();i++)
{
List<WebElement> cells= tablerow.get(i).findElements(By.tagName("td"));
for(int j=4;j<cells.size();j++){
List<WebElement> cellSubRow= cells.get(i).findElements(By.tagName("td"));
System.out.println(cellSubRow.get(j).getText());}}