RxJAVA 中 Function 是如何实现的？ - V2EX

RxJAVA 中 Function 是如何实现的？ - V2EX

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这是一个创建于 1770 天前的主题，其中的信息可能已经有所发展或是发生改变。

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

pre>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

4 条回复 2021-02-26 18:36:13 +08:00

1

kassadin

2021-02-26 17:16:52 +08:00

kotlin 的语法糖 SAM，可以用 lambda 简写。single abstract method interface，大概是这么拼的吧

2

Kasumi20

2021-02-26 17:54:57 +08:00

而且还不用 new 关键字呢，这是 Kotlin 鸭不是 Java

3

LGA1150

2021-02-26 17:57:45 +08:00 via Android

4

DiDiz

2021-02-26 18:36:13 +08:00

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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