取两个map交集、并集、差集

引入pom:

com.google.guavaguava31.1-android

话不多说，直接上代码：

import com.google.common.collect.MapDifference;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import org.apache.poi.ss.formula.functions.T;import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;public class MapUtils
{public static boolean hasDifference(ConcurrentMap leftMap, ConcurrentMap rightMap){MapDifference difference = Maps.difference(leftMap, rightMap);return difference.areEqual();}/*** 取Map集合的差集*/public static  ConcurrentMap getDifferenceSetByGuava(ConcurrentMap leftMap, ConcurrentMap rightMap){if (null != leftMap && null != rightMap){Set leftMapKey = leftMap.keySet();Set rightMapKey = rightMap.keySet();Set differenceSet = Sets.difference(leftMapKey, rightMapKey);ConcurrentMap result = new ConcurrentHashMap<>();for (S key : differenceSet){result.put(key, leftMap.get(key));}return result;}else{return null;}}/*** 取Map集合的交集（String,String）*/public static  ConcurrentMap getIntersectionSetByGuava(ConcurrentMap leftMap, ConcurrentMap rightMap){if (null != leftMap && null != rightMap){Set leftMapKey = leftMap.keySet();Set rightMapKey = rightMap.keySet();Set differenceSet = Sets.intersection(leftMapKey, rightMapKey);ConcurrentMap result = new ConcurrentHashMap<>();for (S key : differenceSet) {result.put(key, leftMap.get(key));}return result;}else{return null;}}/*** 取Map集合的并集*/public static  ConcurrentMap getUnionSetByGuava(ConcurrentMap leftMap, ConcurrentMap rightMap){if (null != leftMap && null != rightMap){Set leftMapKey = leftMap.keySet();Set rightMapKey = rightMap.keySet();Set differenceSet = Sets.union(leftMapKey, rightMapKey);ConcurrentMap result = new ConcurrentHashMap<>();for (S key : differenceSet){if (leftMap.containsKey(key)){result.put(key, leftMap.get(key));}else{result.put(key, rightMap.get(key));}}return result;}else{return null;}}}

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