Instance initializers allow you to execute construction code for an anonymous inner class.

实例初始化器允许您为一个匿名内部类执行构造代码。

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For example, only final object references from the outer class are invokable within the body of the anonymous inner class.

例如，在匿名内联类的主体中，只能调用外部类中的 final 对象引用。

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Here, the ActionListener implementation is defined in place, as an anonymous inner class, and directly attached to the button.

这里，ActionListener实现是适时定义的，它定义为一个匿名内部类，并直接附加到按钮上。

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