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Dart语言Set.from()方法
void main() { Set numberSet = new Set.from([12,13,14]); print("Default implementation :${numberSet.runtimeType}");
Dart语言收集组
void main() { Set numberSet = newSet(); numberSet.add(100); numberSet.add(20); numberSet.add(5); numberSet.add(60);
Dart语言集合列表
void main() { List logTypes = new List(); logTypes.add("WARNING"); logTypes.add("ERROR");
Dart语言迭代集合
import 'dart:collection'; void main() { Queue numQ = new Queue(); numQ.addAll([100,200,300]);
Dart语言级联运算符..
class Student { void test_method() { print("This is atest method"); } void test_method1() {
Dart语言对象
class Student { void test_method() { print("This is atest method"); } void test_method1() {
Dart语言super关键字
void main() { Child c = new Child(); c.m1(12); } class Parent { String msg = "message variable from the parent class";
Dart语言更新列表
void main() { List l = [1, 2, 3,4,5,6,7,8,9]; print('The value of list before replacing ${l}');
Dart语言位运算符
void main() { var a = 2;// Bit presentation 10 var b = 3;// Bit presentation 11 var result = (a & b);
Dart语言条件表达式
void main() { var a = 10; var res = a > 12 ? "value greater than 10":"value lesser than or equal to 10";
Dart语言并发
import 'dart:isolate'; void foo(var message){ print('execution from foo ... the message is :${message}');
Dart语言异步
import 'dart:io'; void main() { print("Enter your name :"); // prompt for user input
Dart语言Typedefs示例2
typedef ManyOperation(int firstNo , int secondNo);//function signature Add(int firstNo,int second){ print("Add result is ${firstNo+second}");
Dart语言Typedef示例
typedef ManyOperation(int firstNo , int secondNo); //function signature Add(int firstNo,int second){ print("Add result is ${firstNo+second}");
Dart语言添加断点
void main() { int a = 10, b = 20, c = 5; c = c * c * c; print("$a + $b = ${a+b}"); print("$a%$b = ${a%b}");// Add a break point here
Dart语言自定义异常
class AmtException implements Exception { String errMsg() => 'Amount should be greater than zero';