Dart中的类对象操作列表

问题描述

下面的代码块有问题.

class Events
{
 // some member variables
}


class SVList
{ 
  String name;
  int contentLen;
  List<Events> listEvents;  

  SVList()
  {
    this.name = "";
    this.contentLen = 0;
    this.listEvents = new List<Events>();
  }
}

class GList
{
  List<SVList> listSVList;

  GList(int Num)
  {
   this.listSVList = new List<SvList>(num);   
  } 
}


 function f1 ()
 {
   //array of class objects 
   GList gList = new GList(num);
 }

在调用GList构造函数后无法找到"listEvents"成员.我在这里想念什么吗?

Not able to find "listEvents" member after GList constructor is called. Am I missing anything here.

引用 glist.listSVList [index] ->找不到成员变量'listEvents'.任何指针表示赞赏.

Referencing glist.listSVList[index] --> do not find member variable 'listEvents'. Any pointers appreciated.

详细地说，找不到带有'glist.listSVList [index] .listEvents'的成员变量.

To elaborate , no member variable with 'glist.listSVList[index].listEvents' is found.

推荐答案

您在这里有错字:

this.listSVList = new List<SvList>(num);  // <== SVList not SvList

功能在这里似乎是错误的

function f1 () { ... }

在这种情况下，您使用 function 作为返回类型

in this case you use function as a return type

另一种错字:

GList(int Num) // <== Num (uppercase)
{
  this.listSVList = new List<SvList>(num);   // <== num (lowercase)
} 

此代码有效:

class Events {
  // some member variables
}

class SVList {
  String name;
  int contentLen;
  List<Events> listEvents;

  SVList() {
    this.name = "";
    this.contentLen = 0;
    this.listEvents = new List<Events>();
  }
}

class GList {
  List<SVList> listSVList;

  GList(int num) {
    this.listSVList = new List<SVList>(num);
  }
}


main() {
  //array of class objects
  GList gList = new GList(5);
  gList.listSVList[0] = new SVList();
  gList.listSVList[0].listEvents.add(new Events());
  print(gList.listSVList[0].listEvents.length);
}

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