How to open new tab

Question

Robot rb =new Robot();

rb.keyPress(KeyEvent.VK_CONTROL);

rb.keyPress(KeyEvent.VK_T);

rb.keyRelease(KeyEvent.VK_CONTROL);

rb.keyRelease(KeyEvent.VK_T);

ArrayList<String> tabs = new ArrayList<String> (driver.getWindowHandles());

driver.switchTo().window(tabs.get(1)); 

Answer 1

Just add a pause after creating new tab as follows:

Robot rb = new Robot();
rb.keyPress(KeyEvent.VK_CONTROL);
rb.keyPress(KeyEvent.VK_T);
rb.keyRelease(KeyEvent.VK_CONTROL);
rb.keyRelease(KeyEvent.VK_T);
// add a pause
Thread.sleep(1000);
ArrayList<String> tabs = new ArrayList<String> (driver.getWindowHandles());
driver.switchTo().window(tabs.get(1)); 
// open website in a new tab
driver.get("https://stackoverflow.com");

or even better use WebDriverWait:

Robot rb =new Robot();
rb.keyPress(KeyEvent.VK_CONTROL);
rb.keyPress(KeyEvent.VK_T);
rb.keyRelease(KeyEvent.VK_CONTROL);
rb.keyRelease(KeyEvent.VK_T);
new WebDriverWait(driver, 10).until(ExpectedConditions.numberOfWindowsToBe(2));
ArrayList<String> tabs = new ArrayList<String> (driver.getWindowHandles());
driver.switchTo().window(tabs.get(1));
driver.get("https://stackoverflow.com");

this will wait at least 10 seconds until number of tabs will be 2.

Note: you have to add some imports:

import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;