使用 ArrayListValuedHashMap 用于 MultiValuedMap

Question

预先感谢您，非常感谢！我正在尝试使用 apache commons MultiValuedMap 实现。但是，我似乎无法导入正确的包？？？这是我的进口：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 具有公共依赖项  <dependency>    <groupId>org.apache.commons</groupId>    <artifactId>commons-collections4</artifactId>    <version>4.1</version>  </dependency>但它会引发编译错误[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我尝试了几种导入组合，但没有成功。谢谢你！！！

Answer 1

看来这个组合有效，我不确定这是否正确？

import org.apache.commons.collections4.MultiValuedMap;

//import org.apache.commons.collections4.MultiValuedMap.ArrayListValuedHashMap;

//import org.apache.commons.collections4.map.MultiValueMap;

import org.apache.commons.collections4.multimap.*;

//import org.apache.commons.collections4.*;

//import org.apache.commons.collections4.MultiValuedMap.*;

//import org.apache.commons.collections4.map.*;