Hi,
I am need to to salesforce, I am writing a visualforce page to display check boxes and list of accounts with a process button. Upon slecting the accounts and the check boxes the process button should contain a method which displays the list of contacts related to selected accounts.
I am unable to retrieve the list of contact names using the selected accounts.I am getting an error when i use a soql query to retrieve the contacts using the account id.

Below is my apex code for above requirment.
Please let me know if my question is not clear.


public class accountcontactwrap {
 public list<accountwrap> warpacc{get;set;}
 public list<account> selectedAccounts{get;set;}
 public list<contact> cont{get;set;}
// public list<contactwrap> wrapcon{get;set;}
  public accountcontactwrap(){
   warpacc=new list<accountwrap>();
   for(account ab:[select id,name,phone from account limit 10]){
    warpacc.add(new accountwrap(ab));
   }
  }
  
public void showcontacts(){
cont=new list<contact>();
 for(accountwrap warpobj:warpacc)
 {
  if(warpobj.isSelected==true){
  cont=[select lastname from contact where account.id=warpobj.acc.id];
   
  }
 }
}

 public class accountwrap{
 public account acc{get;set;}
 public boolean isSelected{get;set;}
  public accountwrap(account a){
   acc=a;
   isSelected=false; 
  }