Passing driver instance to another class with constructor

Question

I am passing a WebDriver instance to the class below as

FunctionalComponents fc = new FunctionalComponents(driver)

from another class, but the object creation happens before constructor is executed. As it is, the objects created are having null value in the driver instance.

How can I solve this problem?

public class FunctionalComponents  
{    
    public FunctionalComponents(WebDriver driver) 
    {
        this.driver = driver;                            
    }

    CaptureElement element= new CaptureElement(driver);

    public void Method()
    {
        // method logic
        // i call object element here
    }
}

JimEvans · Accepted Answer · 2017-10-21 22:27:32Z

2

Don’t set the value of your member variable outside during the field definition. Do it from within the constructor, which will guarantee the population of the variables as you’d like. To wit:

public class FunctionalComponents  
{
    private IWebDriver driver;
    private CaptureElement element;

    public FunctionalComponents(WebDriver driver) 
    {
        this.driver = driver;
        this.element = new CaptureElement(driver);
    }

    public void Method()
    {
        // method logic
        // i call object element here
    }
}

edited Oct 21, 2017 at 22:27

answered Oct 21, 2017 at 21:18

JimEvans

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2 Comments

JeffC Over a year ago

Hey Jim, you haven't declared the driver instance in the FunctionalComponents class. I think you meant to add private WebDriver driver;? Otherwise this.driver is going to fail... well it won't compile but you know what I mean.

JimEvans Over a year ago

Neither will the original poster’s code, for the same reason. :) Of course, you’re right, but I was really just trying to demonstrate the solution. Edited answer to fix.

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