java - HashMap 类型找不到符号

Question

我有一个包含一些 HashMap 类型的类:

private class XmlHandler extends DefaultHandler{
    private HashMap<String, String> Attribs;
    private HashMap<String, List<Attribs> >FragmentNode;
    private HashMap<String, List<FragmentNode> > ActivityNode;

编译时，我收到此错误:

cannot find symbol FragmentNode and Attribs.

如果我修改插入原始类型的声明，即更改 HashMap<String, List<Attribs>至HashMap<String, HashMap<String, String>>编译器停止提示。

我需要这样做吗？ Java 不理解这样的类型声明？

Answer 1

FragmentNode 和 Attribs 不是类型，它是变量，您不能将变量指定为 HashMap 的类型。

你可以这样做:

private HashMap<String, List<HashMap<String, String>>> FragmentNode;

或者您可以创建一个具有 Attribs HashMap 的类，如下所示:

public class Attribs {

    private HashMap<String, String> Attribs;

}

然后:

 private HashMap<String, List<Attribs>> FragmentNode;