How to Close Second Window in Java Selenium Example Program?

How to Close Second Window in Java Selenium Example Program?

package com.selenium.switchto;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
public class Close2ndWindiw 
{
   WebDriver driver=new FirefoxDriver();
   @BeforeTest
   public void open()
   {
      driver.manage().window().maximize();
      driver.get("http://demoqa.com/frames-and-windows/");
      driver.manage().timeouts().implicitlyWait(15000, TimeUnit.SECONDS);
   }
   @Test
   public void operation() throws InterruptedException
   {
      //String parent=driver.getWindowHandle();
      driver.findElement(By.xpath(".//*[@id='tabs-1']/div/p/a")).click();
      Thread.sleep(2000);
      Set<String> handles=driver.getWindowHandles();
      int count=0;
      for(String h:handles)
      {
         count++;
         System.out.println(count);
         if(count==1)
         {
            driver.switchTo().window(h);
            driver.close();	
         }
         else
         {
            continue;
         }
      }
      //driver.switchTo().window(parent);
      //driver.close();
   }
}