Pre-populate an Account name on my vf page for creating contacts

Question

My visualforce page creates many contacts in one go. I want to pre-populate a certain account name when the page is loaded. Even though it always pre-populates a certain account, user should have the ability to use the lookup and change to another account if wanted. How can I do this?

My visualforce code used in the pageblocktable

<apex:column headerValue="Account Name">
    <apex:inputField value="{!eachRecord.record.AccountId}" required="true"/>
</apex:column>

Controller

public with sharing class AddMultipleContactsController {

    public List<WrapperContactList> contList {get; set;}
    public Integer rowToRemove {get; set;}

    public AddMultipleContactsController() {
        contList = new List<WrapperContactList>();
        addNewRowToContList();
    }

    public void addNewRowToContList(){
        contList = AddMultipleContactsHelper.addNewRowToContList(contList);
    }

    public void removeRowFromContList(){
        contList = AddMultipleContactsHelper.removeRowToContList(rowToRemove, contList);
    }

    public PageReference SaveMultipleContacts(){
        try{
            AddMultipleContactsHelper.save(contList);
        }catch(Exception ex){
            ApexPages.addMessage(new Apexpages.Message(Apexpages.Severity.ERROR,ex.getMessage()));
        }
        ApexPages.AddMessage(new ApexPages.Message(ApexPages.Severity.CONFIRM,'All Contact Records have been successfully Saved'));
        return null;
    }

    public PageReference SaveMultipleContactsAndClose(){
        try{
        AddMultipleContactsHelper.save(contList);
        }catch(Exception ex){
            ApexPages.addMessage(new Apexpages.Message(Apexpages.Severity.ERROR,ex.getMessage()));
        }
        PageReference contactPage = new PageReference('/003/o');
        return contactPage;
    }

    public class WrapperContactList{
        public Integer index {get; set;}
        public Contact record {
        get{
            if(record.AccountId == null){
                Account_Setting__c m = new Account_Setting__c.getInstance();
                record.AccountId = m.Acccount_Id__c;
            }
            return record;
        } set {record = value;}
    }
    }
}

Answer 1

Create a hierarchy custom setting into your system by following these steps

Define new custom field of type text.

Click on Manage to fill Account id value.

After creating custom settings you can access that value inside your controller in following way.

 public contact record {
  get {
     //fill only if accountid is null but you can put some other logic here. 
     if(record.Accountid==null)
     {
        //Call custom setting and fill the account id.
        Manage_System__c m = Manage_System__c.getinstance();

        record.Accountid = m.Account_ID__c;
     }
     return record; 
  }
  set { record = value; }


}