void main() { Car c1 = new Car.namedConst('E1001'); Car c2 = new Car(); } class Car { Car() { print("Non-parameterized constructor invoked");

// Dart语言构造函数 void main() { Car c = new Car('E1001'); } class Car { Car(String engine) {

void main() { Car c= new Car(); c.disp(); } class Car { // field String engine = "E1001"; // function

void main() { Calculator c = new Calculator(); print("The gross total : ${c.ret_tot()}"); print("Discount :${c.ret_dis()}");

void main() { ConsolePrinter cp= new ConsolePrinter(); cp.print_data(); } class Printer { void print_data() {

void main() { printMsg(); print(test()); } printMsg()=> print("hello"); int test()=>123;

void main() { print(factorial(6)); } factorial(number) { if (number <= 0) { // termination case return 1;

// 带有默认值的可选参数 void main() { test_param(123); } void test_param(n1,{s1:12}) { print(n1);

// Dart语言可选的命名参数 void main() { test_param(123); test_param(123,s1:'hello');

// Dart语言可选的位置参数 void main() { test_param(123); } test_param(n1,[s1]) { print(n1); print(s1);

void main() { test_param(123,"this is a string"); } test_param(int n1,String s1) { print(n1);

import 'dart:collection'; void main() { Queue numQ = new Queue(); numQ.addAll([100,200,300]);

import 'dart:collection'; void main() { Queue numQ = new Queue(); numQ.addAll([100,200,300]);

import 'dart:collection'; void main() { Queue queue = new Queue(); print("Default implementation ${queue.runtimeType}");

import 'dart:collection'; void main() { Queue queue = new Queue(); print("Default implementation ${queue.runtimeType}");

void main() { var details=new Map(); details['Usrname']='admin'; details['Password']='admin@123';

import 'dart:collection'; void main() { Set numberSet = newHashSet(); numberSet.addAll([100,200,300]);

import 'dart:collection'; void main() { Set numberSet = newHashSet(); numberSet.addAll([100,200,300]);

import 'dart:collection'; void main() { Set numberSet = newHashSet(); numberSet.add(100); numberSet.add(20);

import 'dart:collection'; main() { var accounts = new HashMap(); accounts['dept'] = 'HR';

import 'dart:collection'; main() { var accounts = new HashMap(); accounts.addAll({'dept':'HR','email':'[email protected]'});

import 'dart:collection'; main() { var accounts = new HashMap(); accounts['dept']='HR';

void main() { Set numberSet = new Set.from([12,13,14]); print("Default implementation :${numberSet.runtimeType}");

void main() { Set numberSet = newSet(); numberSet.add(100); numberSet.add(20); numberSet.add(5); numberSet.add(60);

void main() { List logTypes = new List(); logTypes.add("WARNING"); logTypes.add("ERROR");

import 'dart:collection'; void main() { Queue numQ = new Queue(); numQ.addAll([100,200,300]);

class Student { void test_method() { print("This is atest method"); } void test_method1() {

class Student { void test_method() { print("This is atest method"); } void test_method1() {

void main() { Child c = new Child(); c.m1(12); } class Parent { String msg = "message variable from the parent class";

void main() { List l = [1, 2, 3,4,5,6,7,8,9]; print('The value of list before replacing ${l}');