How to create extension controller for visual force page and get url params

Visualforce Page:

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<apex:page standardController="Account" extensions="CurrentRecordIdDemoController">   <apex:form >     <apex:pageBlock >         <apex:pageBlockSection title="Current account record Id is : {!currentRecordId}" collapsible="false">             <apex:outputField value="{!acc.name}"/>             <apex:outputField value="{!acc.AccountNumber}"/>             <apex:outputField value="{!acc.Type}"/>             <apex:outputField value="{!acc.Industry}"/>         </apex:pageBlockSection>                   <apex:pageBlockSection title="Testing parameter" collapsible="false">             Name is <b>{!parameterValue}</b>         </apex:pageBlockSection>               </apex:pageBlock>   </apex:form> </apex:page>

Apex Code:

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public class CurrentRecordIdDemoController{ public String currentRecordId {get;set;} public String parameterValue {get;set;} public Account acc{get;set;}     public CurrentRecordIdDemoController(ApexPages.StandardController controller) {         currentRecordId  = ApexPages.CurrentPage().getparameters().get('id');         acc = [select id ,name, AccountNumber, Type, Industry from  Account where id =: currentRecordId ];         parameterValue = ApexPages.CurrentPage().getparameters(). get('nameParam');     } }