salesforce UserInfo Methods example

salesforce_userinfo_methods_example.cls

VF Page:
<apex:page controller="con">
  <apex:pageBlock >
  <apex:pageBlockTable value="{!varuser}" var="item">
  <apex:column value="{!item.name}"/>
  <apex:column value="{!item.Email}"/>
  </apex:pageBlockTable>
  </apex:pageBlock>
  <apex:outputText value="{!test}"></apex:outputText>
</apex:page>



Controller Code:
public class con {

    public String test { get; set; }

    public List<contact> varuser { get; set; }
 public string id1;
    string id2=userinfo.getUserId();
    user u=[select email from user where id=:id2];
    public con(){
     id1 = userinfo.getProfileId();
  string str='Select  Name,email from Contact where email='+'\''+u.email+'\'';
  test=str;
   varuser=Database.query(str);  
}
}