如何迭代通过嵌套类？ [英] How to iterate through nested classes?

问题描述

另一个简单的一个！

我想在Android项目中迭代嵌套类。

I'm trying to iterate through nested classes in an android project.

类结构是：

    public class clsMessage {
    public String Username = "";
    public String Password = "";
    public String Request = "";

    public class Parameters {
        public String Name = "";
        public String Value = "";
    }
}

外部类实例化为msg。然后我想我会这样询问：

The outer class is instantiated as "msg". Then I thought I'd query it like this:

    for (clsMessage.Parameters params : msg) {
    //    do stuff
    }

但这不起作用，我找不到例如在谷歌令人惊讶，除非我应该使用一个迭代器在外部类

But that doesn't work and I can't find an example on Google surprisingly, unless I should be using an iterator in the outer class?

推荐答案

我猜你正在寻找东西如下所示。

I am guessing you are looking for something like the following.

public class ClsMessage 
{
    public String username = "";
    public String password = "";
    public String request = "";

    public List<Parameters> parameters = new ArrayList<Parameters>();

    public static class Parameters {
        public String name = "";
        public String value = "";
    }
}

for(ClsMessage.Parameters param : clsMessage.parameters)
{
    ....
}

只是声明一个内部类实际上不会有一个inner class你需要为它做一个字段。
考虑到你想用一个for循环迭代它，我假设你想要多于一个 Parameters 在你的消息，所以我添加了一个列表。

Just declaring an inner class won't actually have an "inner class" as a field. You would need to make a field for it. Considering you wanted to iterate through it with a for-loop, I assumed you wanted more than one Parameters in your message, so I added a List.

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