How to Handle Javascript Alert, Prompt, Confirmation dialog

import org.openqa.selenium.Alert;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;


public class JavaScriptAlertTest {

    public static void main(String[] args) throws InterruptedException {


        WebDriver myTestDriver = new FirefoxDriver();
        myTestDriver.get("http://tinyurl.com/d3lz94p");

        myTestDriver.manage().window().maximize();

        myTestDriver.findElement(By.xpath("//input[@value = 'alert']")).click();
        Thread.sleep(2000L);
        Alert javascriptAlert = myTestDriver.switchTo().alert();
        System.out.println(javascriptAlert.getText()); // Get text on alert box
        javascriptAlert.accept();


        System.out.println("*************prompt******************************************");

        myTestDriver.findElement(By.xpath("//input[@value = 'prompt']")).click();
        Thread.sleep(2000L);
        Alert javascriptprompt = myTestDriver.switchTo().alert();
        javascriptprompt.sendKeys("This is Selenium Training");

        System.out.println(javascriptprompt.getText()); // Get text on alert box

        javascriptprompt.accept();
        javascriptprompt = myTestDriver.switchTo().alert();

        System.out.println(javascriptprompt.getText()); // Get text on alert box
        javascriptprompt.accept();


        myTestDriver.findElement(By.xpath("//input[@value = 'prompt']")).click();
        Thread.sleep(2000L);
        javascriptprompt = myTestDriver.switchTo().alert();

        System.out.println(javascriptprompt.getText()); // Get text on alert box

        javascriptprompt.dismiss();
        javascriptprompt = myTestDriver.switchTo().alert();


        System.out.println(javascriptprompt.getText()); // Get text on alert box
        javascriptprompt.accept();

        Thread.sleep(2000L);
        System.out.println("***********************************confirm dialog box****************************");
        myTestDriver.findElement(By.xpath("//input[@value = 'confirm']")).click();
        Thread.sleep(2000L);
        Alert javascriptconfirm = myTestDriver.switchTo().alert();
        javascriptconfirm.accept();

        javascriptconfirm = myTestDriver.switchTo().alert();
        System.out.println(javascriptconfirm.getText()); // Get text on alert box
        javascriptconfirm.accept();

        myTestDriver.findElement(By.xpath("//input[@value = 'confirm']")).click();
        Thread.sleep(2000L);
        javascriptconfirm = myTestDriver.switchTo().alert();

        javascriptconfirm.dismiss();
        javascriptconfirm = myTestDriver.switchTo().alert();
        System.out.println(javascriptconfirm.getText()); // Get text on alert box
        javascriptconfirm.accept();

        myTestDriver.quit();

    }

}