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public with sharing class ShowDynamicAccountFieldController {
 public ShowDynamicAccountFieldController(ApexPages.StandardController controller){
  controller.addFields(dynamicFields);
  Account acc = (Account) controller.getRecord();
 }
 
 public List<String> dynamicFields{
  get{
   if(dynamicFields == null){
    dynamicFields = new List<String>();
    dynamicFields.add('Name');
    dynamicFields.add('AccountSource');
    dynamicFields.add('NumberOfEmployees');
    dynamicFields.add('Rating');
   }
   return dynamicFields;
  }
  private set;
 }
 
 public void showFirstSet(){
  checkAndInitiate();
  dynamicFields.clear();
  dynamicFields.add('Name');
  dynamicFields.add('AccountSource');
 }
 
 public void showSecondSet(){
  checkAndInitiate();
  dynamicFields.clear();
  dynamicFields.add('Name');
  dynamicFields.add('Rating');
 }
 
 public void doReset(){
  checkAndInitiate();
  dynamicFields.clear();
  dynamicFields.add('Name');
  dynamicFields.add('AccountSource');
  dynamicFields.add('NumberOfEmployees');
  dynamicFields.add('Rating');
 }
 
 private void checkAndInitiate(){
  if(dynamicFields == null){
   dynamicFields = new List<String>();
  }
 }
}