PhoneGap Phone Number Discoverer

config.xml

<plugin name="TelephoneNumber" 
        value="com.simonmacdonald.cordova.plugins.TelephoneNumber"/>

permission.xml

<uses-permission 
    android:name="android.permission.READ_PHONE_STATE" />

scriptTag.html

<script type="text/javascript" charset="utf-8" 
        src="telephonenumber.js"></script>

telephonenumber.java

public boolean execute(String action, JSONArray args, CallbackContext callbackContext) {
    if (action.equals("get")) {
        TelephonyManager telephonyManager =
            (TelephonyManager)this.cordova.getActivity().getSystemService(Context.TELEPHONY_SERVICE);
        String result = telephonyManager.getLine1Number();
        if (result != null) {
            callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, result));
            return true;
        } else {
            callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.ERROR, 0));
            return false;
        }
    }
    callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
    return false;
 }

telephonenumber.js

cordova.define("cordova/plugin/telephonenumber",
  function(require, exports, module) {
    var exec = require("cordova/exec");
    var TelephoneNumber = function () {};

    var TelephoneNumberError = function(code, message) {
        this.code = code || null;
        this.message = message || '';
    };

    TelephoneNumber.NO_TELEPHONE_NUMBER = 0;

    TelephoneNumber.prototype.get = function(success,fail) {
        var errorCallback = typeof fail !== 'function' ? null : function(code) {
            fail({"code": code});
        };
        exec(success,errorCallback,"TelephoneNumber", "get",[]);
    };

    var telephoneNumber = new TelephoneNumber();
    module.exports = telephoneNumber;
});

usage.js

var telephoneNumber = cordova.require("cordova/plugin/telephonenumber");
telephoneNumber.get(function(result) {
        console.log("result = " + result);
    }, function(error) {
        console.log("error = " + error.code);
    });

Hi, what do we do with the java file please?