how to upload a file using selenium webdriver in java code example

Example 1: how to upload a file in selenium java

driver.findElement(By.id("urid")).sendKeys("drive:\\path\\filename.extension");

Example 2: downloading file in selenium

Selenium itself cannot verify file downloads, can click on download link
but can't go outside the browser and open the downloaded file 
Other tools need to be used for that Robot and AutoIT