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问题描述

我是初学者,我无法理解 Iterable 界面的实际效果。

I am a beginner and I cannot understand the real effect of the Iterable interface.

推荐答案

除了杰里米所说的,它的主要好处是它有一些语法糖:。如果你有一个 Iterable< String> ,你可以这样做:

Besides what Jeremy said, its main benefit is that it has its own bit of syntactic sugar: the enhanced for-loop. If you have, say, an Iterable<String>, you can do:

for (String str : myIterable) {
    ...
}



Iterator< String> 的所有脏工作,检查它是否 hasNext(),并调用 str = getNext()由编译器在幕后处理。

Nice and easy, isn't it? All the dirty work of creating the Iterator<String>, checking if it hasNext(), and calling str = getNext() is handled behind the scenes by the compiler.

由于大多数集合都实现了 Iterable 或者有一个返回一个的视图(例如 Map 's keySet() values()),这使得处理集合变得更加容易。

And since most collections either implement Iterable or have a view that returns one (such as Map's keySet() or values()), this makes working with collections much easier.

给出了实现 Iterable 的类的完整列表。

The Iterable Javadoc gives a full list of classes that implement Iterable.

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09-19 02:16