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class Main{

    public static void main(String... args) {
 
        System.out.println("Hello World!");
    }
}

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print("Hello World!")

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//Notice no access specifier (public, private) or static keyword
main() {
  
  //Top-level function
  print('Hello World');
  
}

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class DemoClass {

  //public function
  void printSomething(){

    print('Something');

  }

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class Box {
  
  private int length, width, height;
  
  public Box(int length, int height, int width) {
   
    this.length = length;
    this.height = height;
    this.width = width;

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class Box {

  int _length, _width, _height;
  
  Box(this._length, this._width, this._height);

}

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class Point {
  num x, y;

  Point(this.x, this.y);

  // Named constructor
  Point.origin() {
    x = 0;
    y = 0;

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main() {
 
  Box box1 = new Box();
  
  box1?.destroy();
  
}

//This is equivalent to

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main() {
  
 var number = 5;
  
 var demoString = "The number is $number";
  
}

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import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(