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方法get(int)未定义类型Set(method get(int) is undefined for the type Set)

我写了一段逻辑,我的目标是从地图中选择随机密钥。 该地图已被指定为ConcurrentSkipListMap<Text,IntWritable> tuples 。 另外,我对Java没有任何工业级经验,所以很难克服这个问题。

这段代码是

Set<Text> keys = tuples.keySet();
String randomKeys = keys.get(random.netInt(keys.size()))

我无法找出错误语句: method get(int) is undefined for the type Set<Text>

此外,我已经搜索了类似的问题,并且使用List确实存在解决方案,但我的键/值对存储为ConcurrentSkipListMap ,因此无法弄清楚这一点。

谢谢。


I have written a piece of logic, where, my goal is to select random keys from the map. The map has been assigned as a ConcurrentSkipListMap<Text,IntWritable> tuples. Also, I don't have any industrial level experience with Java, so struggling to get over this.

The piece of code is

Set<Text> keys = tuples.keySet();
String randomKeys = keys.get(random.netInt(keys.size()))

I am not able to figure out the error statement: method get(int) is undefined for the type Set<Text>

Also, I have searched for the similar problem, and a solution do exist using List, but my key/value pairs are stored as ConcurrentSkipListMap, so not able to figure out this.

Thanks.


原文:https://stackoverflow.com/questions/27548524
更新时间:2023-04-27 21:04

最满意答案

在XCTest中有对此功能的简写支持。

对于任何元素的第一个匹配,您可以获取所有元素并点击第一个元素:

let app = XCUIApplication()
let element = app.descendentsMatchingType(.Any)["someIdentifier"]
element.tap()

如果你知道它将会是什么类型的元素,最好先用这种类型进行过滤:

let app = XCUIApplication()
let element = app.buttons["someIdentifier"]
element.tap()

There is shorthand support for this function in XCTest.

For tapping the first match out of any element, you can get all elements and tap the first one:

let app = XCUIApplication()
let element = app.descendentsMatchingType(.Any)["someIdentifier"]
element.tap()

If you know what type of element it is going to be, it's better to filter by that type first:

let app = XCUIApplication()
let element = app.buttons["someIdentifier"]
element.tap()

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