如何将此代码转换为java8 lambda [英] How to convert this code to java8 lambda

问题描述

我刚开始使用Java 8而且我正在努力使用这段代码：

I've just started working with Java 8 and I'm struggling with this code snippet:

paramsValues[idx++] = new ReplyMessage<JsonObject>() {
    @Override
    public void reply(JsonObject reply) {
        message.reply(reply);
    }
};

如何将其转换为Lambda风格？

How to convert this to Lambda style?

推荐答案

如果 ReplyMessage 是功能界面，你可以做

paramsValues[idx++] = reply -> message.reply(reply);

以下是您问题中其他类的存根实现的完整示例：

Here's a full example with stub implementations of the other classes in your question:

// Stub classes
class JsonObject { }

@FunctionalInterface
interface ReplyMessage<T> {
    void reply(T jo);
}

class LambdaDemo {
    public static void main(String args[]) {

        // Dummy variables
        ReplyMessage<JsonObject> message = new ReplyMessage<JsonObject>() {
            public void reply(JsonObject jo) {}
        };
        ReplyMessage[] paramsValues = new ReplyMessage[5];
        int idx = 0;

        // Your code, lambdafied
        paramsValues[idx++] = reply -> message.reply(reply);

        // Or,
        // paramsValues[idx++] = message::reply;

        // But then you could perhaps do with just ...
        // paramsValues[idx++] = message;
    }
}

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