我如何在硒webdriver中编写If和其他功能

if(driver.findElement(By.xpath("*********")).isDisplayed())
         {
               // Click on Teaching Notes
            driver.manage().timeouts().implicitlyWait(20,TimeUnit.SECONDS);     
            driver.findElement(By.xpath("****")).click();     

          driver.manage().timeouts().implicitlyWait(10,TimeUnit.SECONDS);
          Thread.sleep(4000);  

         System.out.println(driver.findElement(By.xpath("***")).getText());
                    System.out.println(driver.getCurrentUrl());
                    driver.navigate().back();
                    driver.navigate().back();

                }
                else
                {
                    System.out.println("No Teaching Notes Present");
                    driver.navigate().back();
                }