Select Multiple Options from dropdown

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.Select;

public class Select_Multiple_Options_from_dropdwon {
    private static WebDriver driver = null;
    public static void main(String[] args) throws InterruptedException {

        // Create a new instance of the Firefox driver
        driver = new FirefoxDriver();

        // Put an Implicit wait, this means that any search for elements on the page could take the time the implicit wait is set for before throwing exception
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

        // Launch the URL
        driver.get("http://www.toolsqa.com/automation-practice-form");

        // Step 3: Select 'Selenium Commands' Multiple select box ( Use Name locator to identify the element )
        Select oSelection = new Select(driver.findElement(By.name("selenium_commands")));

        // Step 4: Select option 'Browser Commands'  and then deselect it (Use selectByIndex and deselectByIndex)
        oSelection.selectByIndex(0);
        Thread.sleep(2000);
        oSelection.deselectByIndex(0);

        // Step 5: Select option 'Navigation Commands'  and then deselect it (Use selectByVisibleText and deselectByVisibleText)
        oSelection.selectByVisibleText("Navigation Commands");
        Thread.sleep(2000);
        oSelection.deselectByVisibleText("Navigation Commands");

        // Step 6: Print and select all the options for the selected Multiple selection list.
        List oSize = oSelection.getOptions();
        int iListSize = oSize.size();
        // Setting up the loop to print all the options
        for(int i =0; i < iListSize ; i++){

            // Storing the value of the option   
            String sValue = oSelection.getOptions().get(i).getText();
            // Printing the stored value
            System.out.println(sValue);
            // Selecting all the elements one by one
            oSelection.selectByIndex(i);
            Thread.sleep(2000);
            }

        // Step 7: Deselect all
        oSelection.deselectAll();

        // Kill the browser
        driver.close();
    }
}