将代码作为函数参数传递 [英] Passing code as function arguments

问题描述

我正在阅读一本教科书，我想知道我们传递给函数的参数是如何既不是原始的，也不是用户定义的类实例。

I was reading a textbook and I was wondering how come the argument we pass to the function is neither a primitive or an user-defined instance of a class.

SwingUtilities.invokeLater(new Runnable() 
{
    public void run() {
        new ButtonDemo();
    }
});

我了解到这是其中之一。但是在这里它似乎传递了用户定义的构造方法，例如Runnable接口（）。看来他们想在以后运行该线程，但什么时候？这是合法的，我认为是，但我从来没有在我的Java类中听说过这样的事情。

I have learned that it was either one of those two. But it seems here that it passes an user-defined constructor method, e.g. Runnable(). It seems they want to run the thread at a later time, but when? And is this even legal, I assume it is, but I never heard of such a thing in my Java class.

推荐答案

这个实际上是传递一个实现Runnable接口的匿名内部类的实例。在 Java教程中了解它们。

This is actually passing an instance of an anonymous inner class implementing the Runnable interface. Read about them in the Java tutorial.

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