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


get current record id salesforce
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');
    }
}

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