// Dart语言List.isNotEmpty方法 void main() { var lst = new List(); lst.add(12); lst.add(13); print(lst.isNotEmpty);

// Dart语言列表isEmpty方法 void main() { var lst = new List(); lst.add(12); lst.add(13); print(lst.isEmpty);

// Dart语言ListFirst()方法 void main() { var lst = new List(); lst.add(12); lst.add(13); print("The first element of the list is: ${lst.first}");

// Dart语言可增长列表 void main() { var lst = new List(); lst.add(12); lst.add(13); print(lst);

void main() { var lst = new List(3); lst[0] = 12; lst[1] = 13; lst[2] = 11; print(lst); }

void main() { print(test()); } String test() { // function definition return "hello world";

void main() { test(); } test() { //function definition print("function called"); }

enum Status { none, running, stopped, paused } void main() { print(Status.values); Status.values.forEach((v) => print('value: $v, index: ${v.index}'));

// Dart语言Runes类的构造函数 main() { Runes input = new Runes( ' \\u{1f605}'); print(new String.fromCharCodes(input));

void main(){ "A string".runes.forEach((int rune) { var character=new String.fromCharCode(rune);

import 'dart:core'; void main(){ f1(); } f1() { String x = 'Runes'; print(x.codeUnits);

import 'dart:core'; void main(){ f1(); } f1() { String x = 'Runes'; print(x.codeUnitAt(0));

import 'dart:mirrors'; void main(){ Symbol lib = new Symbol("foo_lib"); String name_of_lib = MirrorSystem.getName(lib);

void main() { var usrMap = {"name": "Tom", 'Email': '[email protected]'};

void main() { Map m = {'name':'Tom','Id':'E1001'}; print('Map :${m}');

void main() { Map m = {'name':'Tom','Id':'E1001'}; print('Map :${m}');

void main() { Map m = {'name':'Tom','Id':'E1001'}; print('Map :${m}');

void main() { var details = {'Usrname':'tom','Password':'pass@123'};

void main() { var details = {'Usrname':'tom','Password':'pass@123'};

// Dart语言映射length属性 void main() { var details = {'Usrname':'tom','Password':'pass@123'};

// Dart语言映射属性值 void main() { var details = {'Usrname':'tom','Password':'pass@123'};

// Dart语言映射属性键 void main() { var details = {'Usrname':'tom','Password':'pass@123'};

// Dart语言Map构造函数 void main() { var details = new Map(); details['Usrname'] = 'admin';

class StaticMem { static int num; static disp() { print("The value of num is ${StaticMem.num}");

import 'dart:io'; void main() { Child c = new Child(); c.m1(12); } class Parent { void m1(int a){ print("value of a ${a}");}

void main() { Child c = new Child(); c.m1(12); } class Parent { void m1(int a){ print("value of a ${a}");}

void main() { var obj = new Leaf(); obj.str = "hello"; print(obj.str); } class Root { String str;

void main() { var obj = new Circle(); obj.cal_area(); } class Shape { void cal_area() { print("calling calc area defined in the Shape class");

class Student { String name; int age; String get stud_name { return name; } void set stud_name(String name) {

void main() { Car c1 = new Car('E1001'); } class Car { String engine; Car(String engine) { this.engine = engine;