預先感謝您，非常感謝！我正在嘗試使用 apache commons MultiValuedMap 實現。但是，我似乎無法導入正確的包？？？這是我的進口：package com.ge.digital.fleet.dataservice.impl.db;import java.util.Arrays;import java.util.Map;import java.util.ArrayList;import java.util.Collection;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.util.Set;import org.apache.commons.collections4.MultiValuedMap;import org.apache.commons.collections4.MultiValuedMap.ArrayListValuedHashMap;//import org.apache.commons.collections4.map.MultiValueMap;import com.ge.digital.fleet.dataservice.RefDataServiceInvalidDataException;import com.ge.digital.fleet.dataservice.RefDataServiceUnavailableException;public class RefDatabase {    private static final Logger log = LoggerFactory.getLogger(RefDatabase.class);    private MultiValuedMap<String, String> associationsMap = new ArrayListValuedHashMap<>();//      private Map<String,Collection<String>> map = associationsMap.asMap();我的 POM.xml 具有公共依賴項  <dependency>    <groupId>org.apache.commons</groupId>    <artifactId>commons-collections4</artifactId>    <version>4.1</version>  </dependency>但它會引發編譯錯誤[ERROR] C:\Users\212555427\devel\workspaces\jbds\iprcsmartsignal\fleet-predix-new\fleet.mt1.dataserviceimpl\src\main\java\com\ge\digital\fleet\dataservice\impl\db\RefDatabase.java:[11,53] error: cannot find symbol[ERROR]   symbol:   class ArrayListValuedHashMap[ERROR]   location: interface MultiValuedMap[ERROR] C:\Users\212555427\devel\workspaces\jbds\iprcsmartsignal\fleet-predix-new\fleet.mt1.dataserviceimpl\src\main\java\com\ge\digital\fleet\dataservice\impl\db\RefDatabase.java:[21,62] error: cannot find symbol[ERROR]   symbol:   class ArrayListValuedHashMap[ERROR]   location: class RefDatabase我嘗試了幾種導入組合，但沒有成功。謝謝你?。?！