Switching Windows : When clicking on a button open new Tab

// This will capture all the windows/tab in the browser 
ArrayList<String> windowIDs = new ArrayList<String>(driver.getWindowHandles());


//This will move the selenium control to new window or tab
driver.switchTo().window(windowIDs.get(1));

//This will move back the control to Parent window or main window

driver.switchTo().window(windowIDs.get(0));