import static java.util.stream.Collectors.toList;
import java.util.ArrayList;
import java.util.List;
public class Test {
public static void main(String[] args) {
List<String> list1 = new ArrayList();
list1.add("1111");
list1.add("2222");
list1.add("3333");
List<String> list2 = new ArrayList();
list2.add("3333");
list2.add("4444");
list2.add("5555");
// 交集
List<String> intersection = list1.stream().filter(item -> list2.contains(item)).collect(toList());
System.out.println("---得到交集 intersection---");
intersection.parallelStream().forEach(System.out :: println);
// 差集 (list1 - list2)
List<String> reduce1 = list1.stream().filter(item -> !list2.contains(item)).collect(toList());
System.out.println("---得到差集 reduce1 (list1 - list2)---");
reduce1.parallelStream().forEach(System.out :: println);
// 差集 (list2 - list1)
List<String> reduce2 = list2.stream().filter(item -> !list1.contains(item)).collect(toList());
System.out.println("---得到差集 reduce2 (list2 - list1)---");
reduce2.parallelStream().forEach(System.out :: println);
// 并集
List<String> listAll = list1.parallelStream().collect(toList());
List<String> listAll2 = list2.parallelStream().collect(toList());
listAll.addAll(listAll2);
System.out.println("---得到并集 listAll---");
listAll.parallelStream().forEach(System.out :: println);
// set to heavy and
List <String> listAllDistinct = listAll.stream () DISTINCT () the collect (toList ());..
System.out.println ( "--- to give a weight and set listAllDistinct ---") ;
. listAllDistinct.parallelStream () forEach (System.out :: println);
System.out.println("---原来的List1---");
list1.parallelStream().forEach(System.out :: println);
System.out.println("---原来的List2---");
list2.parallelStream().forEach(System.out :: println);
When // generally filter operation instead of parallel streams parallelStream, if used, could lead to thread-safety issues
}
}
Original: https: //blog.csdn.net/gzt19881123/article/details/78327465/
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