Not being able to access Flow variable in Apex class

Question

I am trying to create a flow which creates an account record and then navigates to the newly created record detail page

VF Code

<apex:page Controller="AccFlowController" TabStyle="Account">
<br/>
<flow:interview name="CreateAccount" interview="{!myflow}" finishlocation="{!AID}" />

Apex Class code

 public class AccFlowController{

 public Flow.Interview.Quick_Account myFlow { get; set; }

 public String getmyID() {
 if (myFlow==null) return '';
  else return myFlow.accountId;
 }

 public PageReference getOID(){
 PageReference p = new PageReference('https://dev-dev ed.my.salesforce.com/'+getmyID());
 p.setRedirect(true);
 return p;
 }

}

However, when I try to save the class it is showing

Error: Compile Error: Variable does not exist: accountId

My flow has the following variable present

Answer 1

According to the documentation on Getting Flow Variables, you should call myFlow.getVariableValue:

String accountId = (String)myFlow.getVariableValue('accountId');