hi, i already have a Duplicate list<string>, with 'A'  and 'C'..,
and dymaniclist<string>'A','B','C' 

1)if i select a and c  list<boolean> should be =[true, true]; // a and c   already in duplicate list 
2)if i select a and b list<bolean> should be =[true, false]; // a is in duplicate list 
3)if i select a and b and  c list<bolean> should be =[true, false,true]; // and c in the duplicate list
 

<apex:page controller="test3">
   <apex:form >
   <apex:pageBlock >
      <apex:pageblockTable value="{!wraplist}"  var="a">
       <apex:column ><apex:inputCheckbox value="{!a.selected}"/>{!a.name}</apex:column>
       </apex:pageblockTable>
    <apex:commandButton value="OrderSelected"  reRender="one,two" action="{!duplicatecheck}"/>
      <apex:outputLabel id="one">{!listSelectedNames}</apex:outputLabel>
       <apex:outputLabel id="two">{!Selectedbooleanlist}</apex:outputLabel>
    </apex:pageBlock>
   </apex:form>
</apex:page>

 

public class test3{
 public list<string>listSelectedNames{get;set;}
 public list<Wrapperclass>wraplist{get;set;}
 public list<boolean> Selectedbooleanlist{get;set;}
 public list<string>duplicatevalues{get;set;}
  
  public test3(){
 listSelectedNames = new list<string>();
 Selectedbooleanlist= new list<boolean>();
 duplicatevalues= new list<string>{'a','c'}; //duplicated to filter
 wraplist = new list<Wrapperclass>();
   Wrapperclass   wf = new Wrapperclass();
                  wf.selected=false;
                  wf.name ='a';
                 
    Wrapperclass   wf1 = new Wrapperclass();
                  wf1.selected=false;
                  wf1.name ='b';
                                  
   Wrapperclass   wf2 = new Wrapperclass();
                  wf2.selected=false;
                  wf2.name ='c';
                
          wraplist.add(wf);
          wraplist.add(wf1);
          wraplist.add(wf2);
 }
 
 
   public void duplicatecheck(){
   listSelectedNames.clear();
   Selectedbooleanlist.clear();
    for(wrapperclass wrap: wraplist){
      if(wrap.selected == true){
    listSelectedNames.add(wrap.name);
    Selectedbooleanlist.add(wrap.selected);
        }  
      }
     
     //to check duplicate
     for(String s1 : duplicatevalues){
      if(listSelectedNames.contains(s1)){
         boolean selected =true;
    // Selectedbooleanlist.add(selected);
      //add logic 
       }
    } 
        
        }
 //wrapper classs
    public class Wrapperclass{
       public boolean selected{get;set;}
       public string Name{get;set;}
    }
  
  
}