java中计算集合的交差并集示例代码

  <dependency>   <groupId>com.google.guava</groupId>   <artifactId>guava</artifactId>   <version>22.0</version>  </dependency>  <dependency>   <groupId>org.apache.commons</groupId>   <artifactId>commons-collections4</artifactId>   <version>4.1</version>  </dependency>

  //交集  Set<Integer> intersectionSet = Sets.intersection(set1, set2);  //差集  Set<Integer> subtractSet = Sets.difference(set1, set2);  //并集  Set<Integer> unionSet = Sets.union(set1, set2);

  //交集  Collection<Integer> intersectionSet = CollectionUtils.intersection(set1, set2);  //差集  Collection<Integer> subtractSet = CollectionUtils.subtract(set1, set2);  //并集  Collection<Integer> unionSet = CollectionUtils.union(set1, set2);