RxJAVA 中 Function 是如何实现的? - V2EX
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101110001
V2EX    Java

RxJAVA 中 Function 是如何实现的?

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  •   101110001 Feb 26, 2021 2502 views
    This topic created in 1888 days ago, the information mentioned may be changed or developed.

    创建 Function 对象时不是 Function() ,而是 Function{}

    Function<Int,String> { inVal -> return@Function "string" } 

    且可以调用外部函数

    Function<Int,String> { inVal -> return@Function staticStringVal() } fun staticStringVal(): String { return "string" } 

    看了好久源码,愣是看不懂,能否有大佬解释一下?

    如图,左边是 rxjava 源码中的一部分,右边是使用示例 image.png

    4 replies    2021-02-26 18:36:13 +08:00
    kassadin
        1
    kassadin  
       Feb 26, 2021
    kotlin 的语法糖 SAM,可以用 lambda 简写。single abstract method interface,大概是这么拼的吧
    Kasumi20
        2
    Kasumi20  
       Feb 26, 2021
    而且还不用 new 关键字呢,这是 Kotlin 鸭不是 Java
    LGA1150
        3
    LGA1150  
       Feb 26, 2021 via Android
    DiDiz
        4
    DiDiz  
       Feb 26, 2021   1
    就是个编译器魔法而已,和你用 Java 写匿名内部类是一回事
    ```
    Function<Integer, String> func = new Function<Integer, String>() {
    @Override
    public String apply(Integer t) {
    ...
    }
    }
    ```
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