Groovy是否具有C#中的扩展方法? [英] Does Groovy have extension methods like in C#?

问题描述

我可以像在C#中那样将方法添加到最终类中吗?

Can I add to a method to a final class somehow like in C#?

所以我可以做类似的事情:

So I could do something like:

"Some text".myOwnFunction();

代替:

MyStaticClass.myOwnFunction("Some text");

推荐答案

您可以通过metaClass将其添加到所有将来的字符串实例中

You can either add it to all future string instances via the metaClass

    String.metaClass.myOwnFunction = {-> delegate.length() }
    assert "Tim".myOwnFunction() == 3

或者您可以将其添加到单个实例中

Or you can add it to a single instance

    String a = "Tim"
    a.metaClass.myOwnFunction = {-> delegate.length() }
    assert a.myOwnFunction() == 3

或者您可以在启动时使用

Or you can add these methods when a jar is in the classpath at startup with extension modules

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