确定一个类是否在 Java 中实现了一个接口 [英] Determine if a Class implements a interface in Java

问题描述

我有一个 Class 对象.我想确定 Class 对象表示的类型是否实现了特定的接口.我想知道这是如何实现的?

I have a Class object. I want to determine if the type that the Class object represents implements a specific interface. I was wondering how this could be achieved?

我有以下代码.基本上它所做的是获取指定包中所有类的数组.然后我想遍历数组并将实现接口的 Class 对象添加到我的地图.问题是 isInstance() 将对象作为参数.我无法实例化接口.所以我有点不知所措.有什么想法吗?

I have the following code. Basically what it does is gets an array of all the classes in a specified package. I then want to go through the array and add the Class objects that implement an interface to my map. Problem is the isInstance() takes an object as a parameter. I can't instantiate an interface. So I am kind of at a loss with this. Any ideas?

Class[] classes = ClassUtils.getClasses(handlersPackage);
for(Class clazz : classes)
{
    if(clazz.isInstance(/*Some object*/)) //Need something in this if statement
    {
        retVal.put(clazz.getSimpleName(), clazz);
    }
}

推荐答案

你应该使用 isAssignableFrom:

You should use isAssignableFrom:

if (YourInterface.class.isAssignableFrom(clazz)) {
    ...
}

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