如何交互ArrayList< Class<？扩展IMyInterface>> [英] How to interate a ArrayList<Class<? extends IMyInterface>>

问题描述

我有一个 ArrayList< Class<？扩展IMyInterface>> classes = new ArrayList<>（）; 。当我尝试迭代它时，我得到：

I have an ArrayList<Class<? extends IMyInterface>> classes = new ArrayList<>();. When I try to iterate it, I get:

Incopatible types:  
Required: java.lang.Class <? extends IMyInterface>  
Found: IMyInterface  

我的迭代

for (IMyInterface iMyInterface : IMyInterface.getMyPluggables()) {}

红色代码警告突出显示（Android Studio）

Error:(35, 90) error: incompatible types: Class<? extends IMyInterface> cannot be converted to IMyInterface  

我想

ArrayList<Class<? extends IMyInterface>> classes = new ArrayList<>();

for (Class<? extends IMyInterface> myClass : classes) {
    if (myClass instanceof IMyInterface) {
        View revPluggableViewLL = myClass.getMyInterfaceMethod();
    }
}

ERROR

Inconvertible types; cannot cast 'java.lang.Class<capture<? extends com.myapp.IMyInterface>>' to 'com.myapp.IMyInterface'  

我该怎么办？重复一遍呢？

How can I go about iterating through it?

提前谢谢大家。

推荐答案

您想要根据需要迭代 IMyInterface 的实例调用的特定方法IMyInterface ：

You want to iterate on instances of IMyInterface as you want to invoke a specific method of IMyInterface :

    View revPluggableViewLL = myClass.getMyInterfaceMethod();

问题是您声明了列表 Class 实例：

The problem is that you declared a List of Class instances :

ArrayList<Class<? extends IMyInterface>> classes = new ArrayList<>();

它不包含任何 IMyInterface的实例但只有 Class 个实例。

It doesn't contain any instance of IMyInterface but only Class instances.

为了满足您的需要，请声明一个列表IMyInterface ：

To achieve your need, declare a list of IMyInterface :

List<IMyInterface> instances = new ArrayList<>();

以这种方式使用它：

for (IMyInterface myInterface : instances ) {
   View revPluggableViewLL = myInterface.getMyInterfaceMethod();   
}

请注意，此检查不是必需的：

Note that this check is not required :

if (myClass instanceof IMyInterface) {
    View revPluggableViewLL = myClass.getMyInterfaceMethod();
}

您操纵列表 IMyInterface ，因此 List 的元素必然是 IMyInterface的实例。

You manipulate a List of IMyInterface, so elements of the List are necessarily instances of IMyInterface.

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