How to close new tab or How to open new tab and close it ?

Note- open link in new tab using sendKeys() method by passing arg as 'T'. Then press CONTROL+TAB key to go to new tab. Then press CONTROL+F4 to close new tab.

Please refer the below example-

import java.awt.AWTException;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.Keys;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;

public class NewTab {
    public static void main(String[] args) throws AWTException, InterruptedException {
       
        WebDriver driver = new FirefoxDriver();
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        driver.get("http://selenium-makeiteasy.blogspot.in/search/label/Interview%20Ques-Ans%20for%20Automation%20Tester");
        Actions act = new Actions(driver);
        WebElement link = driver.findElement(By.xpath("//a[text()='How to improve performance of the script in selenium webdriver?']"));
        act.moveToElement(link).contextClick().sendKeys("T").perform(); //open link in new tab
        act.sendKeys(Keys.chord(Keys.CONTROL,Keys.TAB)).perform();//switch to new tab by pressing control+tab
        Thread.sleep(3000); // simply wait for 3sec to see new tab open or not
        act.sendKeys(Keys.chord(Keys.CONTROL,Keys.F4)).perform(); //press control+f4 to close tab
        driver.findElement(By.xpath("//a[text()='Show all posts']")).click(); //click on a 'Show all posts' link of main tab to confirm we are in main tab
    }
}