StandardSetController in salesforce

Hello Shradha,

StandardSetController objects allow you to create list controllers similar to, or as extensions of, the pre-built Visualforce list controllers provided by Salesforce.
The StandardSetController class also contains a prototype object. This is a single sObject contained within the Visualforce StandardSetController class. If the prototype object's fields are set, those values are used during the save action, meaning that the values are applied to every record in the set controller's collection. This is useful for writing pages that perform mass updates (applying identical changes to fields within a collection of objects).

Hello,

StandardSetController allows us to create list controllers similar to, or as extensions of, the pre-built Visualforce list controllers provided by Salesforce.

For e.g-  when you want to override a tab or list view with your custom visualforce page like:-

Page:-

<apex:page standardController="Account" recordsetvar="Accounts extension="AccListController">

<apex:pageBlock>
<apex:pageBlockTable value="{!accountList}" var="acc">
<apex:column value="{!acc.Name}"/>
<apex:column value="{!acc.Amount}"/>
</apex:pageBlockTable>
</apex:pageBlock>

</apex:page>

Controller

public class AccListController{
// ApexPages.StandardSetController must be instantiated
// for standard list controllers
public ApexPages.StandardSetController setCon {
get {
if(setCon == null) {
setCon = new ApexPages.StandardSetController(Database.getQueryLocator(
[SELECT Name, Amount FROM Account]));
}
return setCon;
}
set;
}

// Initialize setCon and return a list of records
public List<Account> getAccountList() {
return (List<Account>) setCon.getRecords();
}
}

Thanks.