HI ,

        I have  written     apex page  for dispalying     questions random ly   form my custom object  ,   while   runing  iam getting System.NullPointerException: Attempt to de-reference a null object  Class.Records20.: line 20, column 1,  , i check ed with console iam getting values ,  i don't know y it is coming ,  i wll show my apex class and   vf and random number gentation calss.

Vf page
--------------------------------
<apex:page controller="Records20" sidebar="false" >
<apex:form >
<apex:pageblock Title="Answers the Questions">
<apex:pageBlockButtons location="bottom">

<apex:commandButton value="Submit" action="{!saveAnswer}"/><br/>
</apex:pageBlockButtons>
<apex:repeat value="{!items1}" var="it">
<apex:outputText value="{!it.intSerial}"> </apex:outputText>).&nbsp;<apex:outputText value="{!it.strQuestion}"></apex:outputText>



<apex:SelectRadio value="{!it.answer12}">
<apex:selectoptions value="{!it.itemsWrap}"/>
</apex:SelectRadio><br/>
</apex:repeat>



</apex:pageblock>
YOUR RESULT IS:&nbsp;&nbsp;<apex:outputText value="{!intCount}"></apex:outputText>
</apex:form>
</apex:page>
--------------------------------------
vf page Controller

public class Records20{

public string answer1{set;get;}
public List<selectOption> selItems {get;set;}
public integer intCount{get;set;}
list<wrapperQuestions> objwraplst = new list<wrapperQuestions>();
list<Questiuons__c> ques=new list<Questiuons__c>();


public Records20()
{
list <Questiuons__c> ret=[SELECT id,Question__c,Answers__c,Correctanswer__c FROM Questiuons__c ];
ret = ObjectRandomizer.randomizeList (ret);
integer serial=0;
for(Questiuons__c a :ret )
{
System.debug('aaa'+a);
String s = a.Answers__c;
list<string> st =s.split(',');-----------  i am gettin  that error here
wrapperQuestions objWrap = new wrapperQuestions();
objWrap.strQuestion = a.Question__c;
objWrap.correctAnswer=a.Correctanswer__c;
serial=serial+1;
objWrap.intSerial=serial;
selItems = new List<selectOption>();
for(String str:st)
{
selItems.add(new SelectOption(str,str));

objWrap.itemsWrap=selItems;

}

objwraplst.add(objWrap);

}
}

public void saveAnswer()
{
intCount=0;
for(wrapperQuestions objwrap:objwraplst)
{
system.debug('::::::::::::'+objwrap.answer12);
if(objwrap.answer12==objwrap.correctAnswer)
{
//intCount = intCount+1;
intCount++;
}
}

}
public list<wrapperQuestions> getitems1()
{
return objwraplst;
}


public class wrapperQuestions
{
public string strQuestion{get;set;}
public integer intSerial{get;set;}
public List<selectOption> itemsWrap {get;set;}
public string answer12{set;get;}
public string correctAnswer{set;get;}

}

}
-------------------------------------------------------------
// Random Number generation
public class ObjectRandomizer {

public static list<Questiuons__c> randomizeList (list<Questiuons__c> Records){

list <Questiuons__c> retList = new list <Questiuons__c>();

while (records.size()>0){
system.debug('++++++' + records.size());
retList.add(records.remove(getRandomInt(records.size())));
}

return retList;
}

public static Integer getRandomInt (Integer num){
Double d = math.random() * num;
return d.intValue();
}

}

  when i  check console iam getting values , console is

3:53:29.055 (55560000)|SYSTEM_METHOD_EXIT|[21]|String.valueOf(Object)
23:53:29.055 (55568000)|HEAP_ALLOCATE|[21]|Bytes:95
23:53:29.055 (55578000)|SYSTEM_METHOD_ENTRY|[21]|System.debug(ANY)
23:53:29.055 (55583000)|USER_DEBUG|[21]|DEBUG|&&&&&&&&&&&&&&(Visible light, Infrared radiation, X-rays and gamma rays, Ultraviolet radiation)
23:53:29.055 (55589000)|SYSTEM_METHOD_EXIT|[21]|System.debug(ANY)
23:53:29.055 (55594000)|STATEMENT_EXECUTE|[23]

23:53:29.060 (60731000)|SYSTEM_METHOD_ENTRY|[19]|System.debug(ANY)
23:53:29.060 (60737000)|USER_DEBUG|[19]|DEBUG|$$$$$$$$$$$Repo rate ,Reverse repo rate,Cash Reserve ratio,base rate
23:53:29.060 (60743000)|SYSTEM_METHOD_EXIT|[19]|System.debug(ANY)
23:53:29.060 (60747000)|STATEMENT_EXECUTE|[20]

  what is the problem , can any one help me

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