Sorting based on column value in salesforce

If you have apex page like:

<apex:commandButton value="Sort Table" action="{!sortMethod}" reRender="pgblcktbl"/>

you are callilng sortMethod:

ublic void sortMethod(){
if(selectedField == 'Name')
accList = [select name,accountnumber,annualrevenue from account where id IN:accList order by Name limit 100 ];
else if(selectedField == 'AccountNumber')
accList = [select name,accountnumber,annualrevenue from account where id IN:accList order by AccountNumber limit 100 ];
else if(selectedField == 'Annualrevenue')
accList = [select name,accountnumber,annualrevenue from account where id IN:accList order by Annualrevenue desc limit 100 ];
}

Something like this you can do that