我如何从Json提取价值

看到此代码是我在应用程序中使用的代码

String data="{'foo':'bar','coolness':2.0, 'altitude':39000, 'pilot':{'firstName':'Buzz','lastName':'Aldrin'}, 'mission':'apollo 11'}";

我像这样找回

JSonObject json = (JSONObject) JSONSerializer.toJSON(data); double coolness = json.getDouble( "coolness" );    int altitude = json.getInt( "altitude" );    JSonObject pilot = json.getJSonObject("pilot");    String firstName = pilot.getString("firstName");    String lastName = pilot.getString("lastName");    System.out.println( "Coolness: " + coolness );    System.out.println( "Altitude: " + altitude );    System.out.println( "Pilot: " + lastName );