Dealing with JavaScript PopUP

import org.openqa.selenium.Alert;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.Test;

//Dealing with JavaScript Popup
public class LearnSel {
    @Test
    public void case1(){
        WebDriver driver = new ChromeDriver();
        driver.get("https://mail.rediff.com/cgi-bin/login.cgi");
        driver.manage().window().maximize();
        driver.findElement(By.name("proceed")).click();
        Alert alert = driver.switchTo().alert();
        String al = alert.getText();
        System.out.println(al);
        alert.accept();
        driver.switchTo().defaultContent();
        driver.close();
       
    }

}