收集< li>硒webdriver中u的元素

我的网页上有广告列表.这些广告显示在ID为adList的标签下.我想从那些广告中点击任意随机广告

I have list of ads on my webpage. Those ads are displayed under tag with id adList. From those ads I want to click on any random ad

所以我所做的如下:

List<WebElement> allads = driver.findElements(By.id("adList"));
assertNotNull(allads);
System.out.println(allads.size());
Random random = new Random();
int index = 0;
for (int i = 1; i <= allads.size(); i++) {    
      index = random.nextInt(allads.size());
}
allads.get(index).click();

但是当我运行代码时，没有广告被点击，当我检查allads.size()时，它显示为1，这是错误的，因为它具有以下多个ID

But when I run the code no ad is getting clicked and when i checked allads.size() count it is shown as 1 which is wrong as has multiple ids as following

<ul id="adList" data-pageno="2">
<div id="feedList">
<li id="210846759">
<li id="210847160">
<li id="210845605">
<li id="210841804">
<li id="210846830">
<li id="210846163">
<li class="adbannerli">
<li id="210844135">
<li id="210845467">
<li id="210619597">
<li id="200780114">
<script type="text/javascript">
</ul>

我应该怎么做才能获取所有li元素并点击任意随机广告

What should I do to get all li elements and click on any random ad