<apex:page sidebar="false" controller="WrapNitesh">
   
 <!--VF PAGE BLOCK-->

 <apex:form >
     <apex:pageBlock >
        <apex:pageBlockButtons >
          <apex:commandButton action="{!ProcessSelected}" value="Show Selected accounts" reRender="block2"/>
        </apex:pageBlockButtons>
       <apex:pageBlockSection columns="2">
         <apex:pageBlockTable value="{!wrapaccountList}" var="waccl">
            
           <apex:column >
             <apex:facet name="header">
               <apex:inputCheckbox />
             </apex:facet>
            <apex:inputCheckbox value="{!waccl.isSelected}" id="InputId"/>
           </apex:column>
            
            <apex:column value="{!waccl.accn.name}"/>
            <apex:column value="{!waccl.accn.phone}"/>
            <apex:column value="{!waccl.accn.billingcity}"/>
         </apex:pageBlockTable>
         
          <apex:pageBlockTable value="{!selectedAccounts}" var="sa" id="block2">
            <apex:column value="{!sa.name}"/>
            <apex:column value="{!sa.phone}"/>
            <apex:column value="{!sa.billingcity}"/>
           </apex:pageBlockTable>
       
       </apex:pageBlockSection>
     </apex:pageBlock>
   </apex:form>
</apex:page>

public class WrapNitesh {

//CONTROLLER CLASS

    public list<wrapaccount> wrapaccountList { get; set; }
    public list<account> selectedAccounts{get;set;}    

      
      public WrapNitesh (){
      
     //if(wrapaccountList ==null){
          wrapaccountList =new list<wrapaccount>();
          for(account a:[select id,name,billingcity,phone from account limit 10]){
           wrapaccountlist.add(new wrapaccount(a));
        
           }
        // }
      }

    //### SELECTED ACCOUNT SHOWN BY THIS METHOD
      public void ProcessSelected(){
     selectedAccounts=new list<account>();
     
      for(wrapaccount wrapobj:wrapaccountlist){
           if(wrapobj.isSelected==true){
           selectedAccounts.add(wrapobj.accn);
           }
            
         }
      }
      
  //##THIS IS WRAPPER CLASS
   // account and checkbox taken in wrapper class
   
   public class wrapaccount{
    
    public account accn{get;set;}
    public boolean isSelected{get;set;}
     
       public wrapaccount(account a){
     
         accn=a;
         isselected=false;
       }
  }
}