How to access filed token in salesforce?

Hi Piyush,

To access the token for a field, use one of the following methods:

Access the static member variable name of an sObject static type, for example, Account.Name.
Call the getSObjectField method on a field describe result.
The field token uses the data type Schema.SObjectField.

In the following example, the field token is returned for the Account object's Description field:

Schema.SObjectField fieldToken = Account.Description;

In the following example, the field token is returned from the field describe result:

// Get the describe result for the Name field on the Account object
Schema.DescribeFieldResult dfr = Schema.sObjectType.Account.fields.Name;

// Verify that the field token is the token for the Name field on an Account object
System.assert(dfr.getSObjectField() == Account.Name);

// Get the describe result from the token
dfr = dfr.getSObjectField().getDescribe();