使用字符串键管理嵌套映射-Managingnestedmapswithstringkeys

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Not sure what you're asking exactly, but I think this is a little easier to read:

不确定你究竟在问什么,但我认为这更容易阅读:

@Override
public String put(final String row, final String column, final String value) {
    /**
     * Second map which is contained by centralMap, that contain Strings as
     * Keys and Values.
     */
    Map nestedMap = centralMap.get(row);
    if (nestedMap == null) {
      nestedMap = new HashMap();
      centralMap.put(row,nestedMap);
    }

    if (!nestedMap.containsKey(column))
        counter++;
    centralMap.put(row, nestedMap);
    return nestedMap.put(column, value);
}

I can't quite understand what you're doing in the second stanza, so can't help you improve that. And I don't see an iterator as referred to in your question.

我不太明白你在第二节中做了什么,所以无法帮助你改进。而且我没有看到你问题中提到的迭代器。

You're making me guess, but maybe ELSEWHERE in your program (it would really help to see more code, and a specific function prototype or statement of behavior you're seeking) you want to be able to iterate through the contents of the centralMap instance, and nested instances of nestedMap. Yes you can.

你猜对了,但是你的程序中可能是ELSEWHERE(它确实有助于查看更多代码,以及您正在寻找的特定函数原型或行为声明)您希望能够遍历centralMap的内容实例和嵌套的嵌套实例。是的你可以。

public void iterateOverAllNested()
{
   for (Map.Entry> nested : centralMap) {
     final String centralKey = nested.key();
     final Map nestedMap = nested.value();
     System.out.println("Central map row/column: "+centralKey);
     for (Map.Entry entry : nestedMap) {
       System.out.println(" key="+entry.key()+", value="+entry.value());
     }
   }
}

Note that this smells. Nested maps of untyped Strings are probably wrong. Any chance you've been writing Perl recently? I suggest you write a second SO question asking about a good data structure for your specific problem. You can include this code as your starting place, and folks will likely offer a cleaner solution.

请注意,这闻起来。无类型字符串的嵌套映射可能是错误的。你最近有没有机会写Perl?我建议你写第二个问题,询问有关特定问题的良好数据结构。您可以将此代码作为起始位置,人们可能会提供更清晰的解决方案。