How to perform actions on table by using perticular text

package rough;

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.log4j.chainsaw.Main;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.Select;

import com.mysql.jdbc.Driver;

public class If_PerticularTextContains_PerformActions {
static WebDriver driver;
public static void main(String[] args) {
    int n = 9;
    //driver=new FirefoxDriver();
    System.setProperty("webdriver.chrome.driver","D:\\selenium_NEW_PRACTICE\\softwares\\chromedriver_win32\\chromedriver.exe");
    driver = new ChromeDriver();
    driver.get("http://www.jtable.org/");   
    driver.manage().window().maximize();
    driver.manage().timeouts().implicitlyWait(60, TimeUnit.SECONDS);
    WebElement table=driver.findElement(By.xpath("//*[@id='StudentTableContainer']/div/table"));
    List<WebElement> th=driver.findElements(By.tagName("th"));
    int col_position=0;
    for(int i=0;i<th.size();i++)
    {
    System.out.println(th.get(i).getText());
     if("City".equalsIgnoreCase(th.get(i).getText())){
         col_position=i+1;
         break;
     }
    }
     List<WebElement> FirstColumns = table.findElements(By.xpath("//tr/td["+col_position+"]"));
    String firstNameOnTable=FirstColumns.get(0).getText();
     System.out.println("first :" + firstNameOnTable);
        for(WebElement e: FirstColumns){
         String ss = e.getText();
            System.out.println(ss);
           
            if(ss.equalsIgnoreCase(firstNameOnTable))
                System.out.println("one");
            {
                    driver.findElement(By.xpath("//*[@id='StudentTableContainer']/div/table/tbody/tr[1]/td[9]/button")).click();
           }    
          
    }
   
   
driver.close();
   
}
}