vara =constImmutablePoint(1,1);// 创建一个常量varb = ImmutablePoint(1,1);// 不会创建常量assert(!identical(a, b));// 两个不同实例 Dart 打印对象数据类型 要在运行时获得一个对象的类型,你可以访问Object的runtimeType属性,它会返回对象的类型。 要测试一个对象的类型请使用类型测试操作
Please see https://api.dart.dev/dart-core/Null-class.html. The Null class is the only class which does not implement Object. But at the same time, the members of this class are marked as override and inherited. This contradicts the statement above.Activity...
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Creates a spatial reference based on WKID for the horizontal coordinate system and vertical coordinate system. factory SpatialReference.fromJson(Map<String, dynamic> json) factory SpatialReference.fromJsonString(String jsonString) factory SpatialReference.fromWkText(String wkText) Creates a spatial...
The hash code for this object. no setteroverriderotationExpression ↔ String The expression describing how attributes values are translated into a rotation to be applied to the GeoElement. getter/setter pairrotationType ↔ RotationType Indicates whether the rotation calculated from the Renderer....
Dart2 类与对象 类和对象 class 关键字声明一个类 创建对象 使用 new + 构造函数() 所有的对象都是继承Object,属基类 创建一个类 voidmain(){Rcperson p1=Rcperson();p1.name='roc';p1.age=8888;p1.run();varp2=Rcperson();p2.name='cor';p2.age=6666;p2.run();}classRcperson{String?name...
while using the generator on a swagger generated by Java, Date is not recognize as dart DateTime swagger RangeDate: type: object properties: startDate: $ref: '#/components/schemas/Date' endDate: $ref: '#/components/schemas/Date' Date: fo...
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls toaddListenerwill throw after the object is disposed). override getMirrored()→bool 获取画面是否镜像
Invalid argument(s): Illegal argument in isolate message: object is unsendable - Library:'dart:async' Class 1. 问题原因: 使用flutter isolate的时候新开的isolate访问了其他isolate的变量导致的 比如下面例子是错误的写法: final zhangsan ="张三";// 这里变量是 主隔离区 声明的变量//run方法在新开的isol...
A string representation of this object. inheritedtoStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String Returns a string representation of this node and its descendants. inheritedtoString...