Closing all opened tabs except the first tab/main tab using webdriver

Try this code it should work:

for(String winHandle : driver.getWindowHandles())
  {
    if (winHandle == driver.getWindowHandles().toArray()[driver.getWindowHandles().size()-1])     
     {
      continue;
     }
    driver.switchTo().window(winHandle);
    driver.close();
  }

I did the following to close all windows but the main one:

// Find out which handle is the one of the main window
String mainWindow = driver.CurrentWindowHandle;

// Get a list of all windows, except the main window
driver.WindowHandles.Where(w => w != mainWindow).ToList()
    // For each window found
    .ForEach(w =>
    {
        // switch to the window
        driver.SwitchTo().Window(w);

        // close the window
        driver.Close();
    });

// At the end, come back to the main window
driver.SwitchTo().Window(mainWindow);

Try this:

for(int i = driver.getWindowHandles().size() -1 ; i > 0 ; i--){

        String winHandle = driver.getWindowHandles().toArray()[i].toString();

        driver.switchTo().window(winHandle);

        driver.close();

}

Get all the window handles then iterate through them, switching webdriver to the new handle, then calling the close method. Obviously skip this for the original handle, then switch back to the remaining handle.

Something like;

    String originalHandle = driver.getWindowHandle();

    //Do something to open new tabs

    for(String handle : driver.getWindowHandles()) {
        if (!handle.equals(originalHandle)) {
            driver.switchTo().window(handle);
            driver.close();
        }
    }

    driver.switchTo().window(originalHandle);