How to handle Alerts using Selenium WebDriver

Selenium WebDriver - Alerts

package SeleniumPractise;

import static org.junit.Assert.*;
import org.junit.Test;
import org.openqa.selenium.Alert;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class AlertsHandle {
 
    @Test
    public void alertsHandle() throws InterruptedException {
        WebDriver driver = new FirefoxDriver();
        driver.get("http://ksrtc.in/");
        Thread.sleep(2000);
        driver.findElement(By.cssSelector(".button1.redbtn")).click();
        Thread.sleep(2000);
        Alert alt = driver.switchTo().alert();
        String exp_msg = alt.getText(); 
        System.out.println(exp_msg); 
        alt.accept();
        Thread.sleep(2000);
        assertEquals(exp_msg, "'From' place is required.");
        driver.quit();
    }
}