CODEMART

5a1 import 'package:flutter/material.dart' ; class MyStatelessWidget extends StatelessWidget {   @override   Widget build ( BuildContext context) {     return Scaffold (       appBar : AppBar (         title : Text ( 'Stateless Widget Example' ),       ),       body : Center (         child : Text (           'Hello, Flutter!' , // In this example, MyStatelessWidget does not change after it is built. The text "Hello, Flutter!" is static.           style : TextStyle (fontSize : 24 ),         ),       ),     );   } } void main () {   runApp ( MaterialApp (     home : MyStatelessWidget (),   )); } 5a2 import 'package:flutter/material.dart' ; class MyStatefulWidget extends StatefulWidget {   @ override   _MyStatefulWidgetState createState...