我已经使用ArrayList和HashSet编写了以下代码。但是哈希集无法按预期工作，这意味着它不会删除重复的项目。但哈希集不允许重复。**HTML** code<HTML> <BODY> <select id= 'WesInn'> <option value = 'idli'> IDLI</option> <option value = 'vada'> VADA</option> <option value = 'sambhar'> SAMBHAR</option> <option value = 'Manchurian'> MACHURIAN</option> <option value = 'idli'> IDLI</option> <option value = 'sambhar'> SAMBHAR</option> <option value = 'Tea'> TEA</option> </select> </body> </html>public class Assgn_DropDownAsc { //static String text; public static void main(String[] args) throws InterruptedException { System.setProperty("webdriver.chrome.driver","./drivers/chromedriver.exe"); WebDriver driver = new ChromeDriver(); driver.get("C:\\Users\\admin\\Desktop\\New folder/Dropdown.html"); List list = new ArrayList (); LinkedHashSet hs = new LinkedHashSet(); Adding ArrayList elements to the HashSet //in order to remove the duplicate elements and //to preserve the insertion order. hs.addAll(list); //System.out.println(hs); //Removing ArrayList elements hs.clear(); System.out.println(hs); System.out.println(list); //Adding LinkedHashSet elements to the ArrayList hs.addAll(list); //System.out.println(alloptions.size()); System.out.println(list);}}输出：[IDLI VADA SAMBHAR MACHURIAN IDLI SAMBHAR TEA]
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TA贡献1836条经验 获得超13个赞
如果您存储的是输出中提到的String，则程序运行正常，看起来您正在打印列表而不是hashSet-更改System.out.println(list);为System.out.println(hs);
仅在存储类的对象的情况下才重要，在这种情况下，应该正确重写equals（）和hashCode（）方法以使用hashSet。
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