Eliminating two different classes into one in java

I have an interface as shown below

public interface ATMbusinessRule {

    public Map<String, List<ATM>> exceute(String pobCode, String plientlogo) throws BuisnessRuleException;

}

now i have two different classes as shown below, the first one

public class MaestroCardBusinessZZNFRuleImpl implements ATMbusinessRule 

{

public Map<String, List<ATM>> exceute(String pobCode, String ClientId) throws BuisnessRuleException {
        }
}

and the second class is shown as

public class MaestroCardBusinessXXNFRuleImpl implements ATMbusinessRule {

public Map<String, List<ATM>> exceute(String pobCode, String plientlogo) throws BuisnessRuleException {
    {
    }

    }

now i want to change this design as what I am planning to write a simple class which will contain two different methods and the caller class will directly call these two methods and get the return value but i am thinking where the interface will fit in this criteria.Als please let me know which other design criteria will be the best