<apex:page controller="SampleCode">
<apex:form>
    <apex:repeat value="{!AccountList}" var="a">
        <apex:outputField value="{! a.Name}"/>
    </apex:repeat>
    <apex:commandButton value="Submit" action="{! submit}"/>
</apex:form>

public class SampleCode {
public List<Account> Accounts=new List<Account>();
public List<Account> getAccountList(){

    Accounts=[Select Id,Name from Account];
    Details();
    Return Accounts;
}
public pageReference submit(){
    system.debug(2);
    //code here
    return null;
}

public void Details(){
    //Details code here
}