Hi,

You can resolve your issue from following example.

<apex:page controller="Checkbox_Class" Tabstyle="Account">
    <apex:form >
     
        <apex:pageBlock Title="Accounts with CheckBoxes">
            <apex:pageBlockSection Title="List of Available Accounts">
                <apex:dataTable value="{!accounts}" var="a" columnswidth="50px,50px" cellpadding="4" border="1">
                    <apex:column >
                        <apex:facet name="header"> <apex:inputCheckbox >
                            <apex:actionSupport event="onclick" action="{!GetSelected}" onsubmit="checkAll(this)" rerender="Selected_PBS"/>
                            </apex:inputCheckbox>
                        </apex:facet>
                        <apex:inputCheckbox value="{!a.selected}" id="checkedone">
                        <apex:actionSupport event="onclick" action="{!GetSelected}" rerender="Selected_PBS"/></apex:inputCheckbox>
                    </apex:column>
                    <apex:column headervalue="Account Name" value="{!a.acc.Name}" />
                    <apex:column headervalue="Account Number" value="{!a.acc.AccountNumber}" />
                    <apex:column headervalue="Phone" value="{!a.acc.Phone}" />
                </apex:dataTable>
            </apex:pageBlockSection>

            <apex:pageBlockSection Title="Selected Accounts" id="Selected_PBS">
                <apex:dataTable value="{!SelectedAccounts}" var="s" columnswidth="50px,50px" cellpadding="4" border="1">
                    <apex:column headervalue="Account Name" value="{!s.Name}" />
                    <apex:column headervalue="Account Number" value="{!s.AccountNumber}" />
                    <apex:column headervalue="Phone" value="{!s.Phone}" />
                </apex:dataTable>
            </apex:pageBlockSection>

        </apex:pageBlock>
    </apex:form>
    <script>
        function checkAll(cb)
        {
            var inputElem = document.getElementsByTagName("input");
            for(var i=0; i<inputElem.length; i++)
            {
                if(inputElem[i].id.indexOf("checkedone")!=-1)
                inputElem[i].checked = cb.checked;
            }
        }
    </script>
</apex:page>

public class Checkbox_Class
{

  
    List<accountwrapper> accountList = new List<accountwrapper>();
    List<Account> selectedAccounts = new List<Account>();

    public List<accountwrapper> getAccounts()
    {
        for(Account a : [select Id, Name, AccountNumber, Phone from Account limit 5])
        accountList.add(new accountwrapper(a));
        return accountList;
    }

    public PageReference getSelected()
    {
        selectedAccounts.clear();
        for(accountwrapper accwrapper : accountList)
        if(accwrapper.selected == true)
        selectedAccounts.add(accwrapper.acc);
        return null;
    }

    public List<Account> GetSelectedAccounts()
    {
        if(selectedAccounts.size()>0)
        return selectedAccounts;
        else
        return null;
    }    

    public class accountwrapper
    {
        public Account acc{get; set;}
        public Boolean selected {get; set;}
        public accountwrapper(Account a)
        {
            acc = a;
            selected = false;
        }
    }
}

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