I'm trying to pass a simple string to a vf page, but can't seem to. What am I doing wrong?

APEX

```
    public class ControllerJSGeo{
    public String pId;

    public String testString {get;set;}

    public ControllerJSGeo(ApexPages.StandardController stdController){
        pId = ApexPages.CurrentPage().getParameters().get('id');

    }

     public String testString(){
       string ts='Hello!';
      return ts;
    }

}

```

VF PAGE

```
<apex:page standardController="Property__c" extensions="ControllerJSGeo">

<head>

<script type="text/javascript" src="https://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> 
<script type="text/javascript"> 

$(document).ready(function() {

  var myOptions = {
    zoom: 18,
    mapTypeId: google.maps.MapTypeId.HYBRID,
    mapTypeControl: true,
    scrollwheel: false
  }

  var map;
  var marker;

  var geocoder = new google.maps.Geocoder();
  var address = "{!Property__c.Property_Address__c}, " + "{!Property__c.City__c}, " + "{!Property__c.State__c} " + "{!Property__c.Zip_Postal_Code__c}}";

  var infowindow = new google.maps.InfoWindow({
    content: "<b>{!Property__c.Name}</b><br>{!Property__c.Property_Address__c}<br>{!Property__c.City__c}, {!Property__c.State__c} {!Property__c.Zip_Postal_Code__c}"
  });

  geocoder.geocode( { address: address}, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK && results.length) {
      if (status != google.maps.GeocoderStatus.ZERO_RESULTS) {

        //create map
        map = new google.maps.Map(document.getElementById("map"), myOptions);
        map.setTilt(45);

        //center map
        map.setCenter(results[0].geometry.location);

        //create marker
        marker = new google.maps.Marker({
            position: results[0].geometry.location,
            map: map,
            title: "{!Property__c.Name}"
        });

        //add listeners
        google.maps.event.addListener(marker, 'click', function() {
          infowindow.open(map,marker);
        });
        google.maps.event.addListener(infowindow, 'closeclick', function() {
          map.setCenter(marker.getPosition()); 
        });

      }

    } else {
      $('#map').css({'height' : '15px'});
      $('#map').html("Oops! {!Property__c.Name}'s billing address could not be found, please make sure the address is correct.");
      resizeIframe();
    }
  });

  function resizeIframe() {
    var me = window.name;
    if (me) {
      var iframes = parent.document.getElementsByName(me);
      if (iframes && iframes.length == 1) {
        height = document.body.offsetHeight;
        iframes[0].style.height = height + "px";
      }
    }
  }

});
</script>

<style>
#map {
  font-family: Arial;
  font-size:12px;
  line-height:normal !important;
  height:800px;
  background:transparent;
}
</style>

</head>

<body>
<div id="map"></div> 
<apex:outputPanel><apex:outputText>{!testString}</apex:outputText></apex:outputPanel>

</body>
</apex:page>

```