在这种情况下(一个方法接口)可以使用lambda吗? [英] Is it possible to use lambdas in this case (One method interface)?

问题描述

我有以下代码:

DialogInterface.OnClickListener closeOnOkClickListener = new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            switch (which){
                case DialogInterface.BUTTON_POSITIVE:
                    finish();
                    break;
            }
        }
    };

我正在尝试将其转换为lambda表达式，但我无法做到.

And I am trying to convert this to a lambda expression but I cannot do it.

有可能吗?

如何?

推荐答案

有可能.每个仅有一种非默认方法的interface都是FunctionalInterface.注释仅用于编译器，以确保interface仅获得了一个非默认方法，否则，您将获得编译器错误.

It is possible. Every interface which just got one non-default method is an FunctionalInterface. The annotation is just for the compiler to make sure the interface just got one non-default method, if not you get a compiler error.

尝试一下:

DialogInterface.OnClickListener closeOnOkClickListener = (dialog, which) -> {
    switch (which){
        case DialogInterface.BUTTON_POSITIVE:
            finish();
            break;
    }
};

对此进行检查FunctionalInterface注释的更大解释.

Check this out for a larger explaination of the FunctionalInterface annotation.

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