a

<apex:page controller="wrapperClassController2">   
<apex:form >       
<apex:pageBlock >           
<apex:pageBlockTable value="{!contacts}" var="c" id="table">               
<apex:column value="{!c.con.Name}" />               
<apex:column headerValue="Email">                 
<apex:outputField value="{!c.con.Email}" styleClass="c.style"/>            
</apex:column>               
<apex:column value="{!c.con.Phone}" />           
</apex:pageBlockTable>       
</apex:pageBlock>   
</apex:form>
</apex:page>

and the class is

public class wrapperClassController2 {   
//Our collection of the class/wrapper objects cContact    
public List<cContact> contactList {get; set;}       
//This method uses a simple SOQL query to return a List of Contacts  
 public List<cContact> getContacts(){       
 if(contactList == null){           
contactList = new List<cContact>();                   
for(Contact c : [select Id, Name, Email, Phone from Contact limit 10]){              
String style = getStyle(c);            
contactList.add(new cContact(c,style));          
}       
    }      
      return contactList;  
       }       
       public String getStyle(Contact con){    
       String style = 'green';    
       if(con.Email.contains('.com')){        
       style = 'red';     
       }               
       return style;   
       }      
       public class cContact{       
       public Contact con {get; set;}      
        public String style {get; set;}             
         public cContact(Contact c, String style){           
         this.con = c;          
          this.style = style;       
      }   
   }
}