Pagination In Salesforce (First Page ,Next,Previous,Last Page)

Controller Code :- 

public class PaginationControllerOpportunity {
    
    Public integer TotalRecordCount=0;
    Public Integer Offsetsize=0;
    Public Integer LimitSize=10;
    
    Public PaginationControllerOpportunity (){
    TotalRecordCount=[Select count() From opportunity];
    }
    
    public boolean getNxt() {
    if((OffsetSize + LimitSize) > TotalRecordCount)
    return true;
    else
    return false;
    }
    
    public boolean getPrev() {
    if(Offsetsize==0)
    return true;
    else
    return false;   
    }

    public void LastPage() {
    Offsetsize = TotalRecordCount - math.mod(TotalRecordCount,LimitSize);
    }

    public void Next() {
      Offsetsize=Offsetsize+LimitSize;
    }

    public void Previous() {
      Offsetsize=Offsetsize-LimitSize;
    }
    
    public void FirstPage() {
     Offsetsize=0;     
    }
  
   
    public List<opportunity> getopplist(){
    List<opportunity> opp= Database.Query('SELECT Name, StageName, CloseDate FROM opportunity LIMIT :LimitSize OFFSET :OffsetSize');
    return opp;
    }
}

VisualForce Page Code :-

<apex:page controller="PaginationControllerOpportunity">
    <apex:form >
        <apex:pageBlock title="All Opportunity Details" id="BlockId">
            <apex:pageBlockTable value="{!Opplist}" var="Opp">
                <apex:column value="{!Opp.name}" />
                <apex:column value="{!Opp.StageName}" />
                <apex:column value="{!Opp.CloseDate }" />
            </apex:pageBlockTable>
            <apex:pageBlockButtons >
                <apex:commandButton action="{!FirstPage}" value="First Page" rerender="BlockId" disabled="{!Prev}" />
                <apex:commandButton action="{!Previous}" value="Previous" rerender="BlockId" disabled="{!Prev}" />
                <apex:commandButton action="{!Next}" value="Next" rerender="BlockId" disabled="{!Nxt}" />
                <apex:commandButton action="{!LastPage}" value="Last Page" rerender="BlockId" disabled="{!Nxt}" />
            </apex:pageBlockButtons>
        </apex:pageBlock>
    </apex:form>
</apex:page>

Screenshot 1 :-