SomeFile.java

public class SomeFile {

    private double getResult(String sValue) {
        Double value1 = Double.valueOf(String.value0f(driver.findElements(By.css("#value1")).getText()));
        Double value2 = Double.valueOf(String.value0f(driver.findElements(By.css(".value2")).getText()));
        String operation = driver.findElement(By.id("opeartion")).getText();
        Double Dresult;
        if (operation.equals("Сумма")) {
            Dresult = value1 + value2;
        } else if (operation.equals("Разница")) {
            Dresult = value1 - value2;
        } else if (operation.equals("Деление")) {
            Dresult = value1 / value2;
        }
        return Dresult;
    }
}