// 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;

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;