@date 2024/6/17 14:44
**/
public class CollectionsTest {
public static void main(String[] args) {
List list1 = new ArrayList<>();
list1.add(“1”);
list1.add(“2”);
list1.add(“3”);
list1.add(“4”);
list1.add(“5”);
List list2 = new ArrayList<>();
list2.add(“2”);
list2.add(“3”);
list2.add(“6”);
list2.add(“7”);
// 交集
List intersection = list1.stream().filter(item -> list2.contains(item)).collect(toList());
System.out.println(“—交集 intersection—”);
intersection.parallelStream().forEach(System.out::println);
// 差集 (list1 - list2)
List reduce1 = list1.stream().filter(item -> !list2.contains(item)).collect(toList());
System.out.println(“—差集 reduce1 (list1 - list2)—”);
reduce1.parallelStream().forEach(System.out::println);
// 差集 (list2 - list1)
List reduce2 = list2.stream().filter(item -> !list1.contains(item)).collect(toList());
System.out.println(“—差集 reduce2 (list2 - list1)—”);
reduce2.parallelStream().forEach(System.out::println);
// 并集
List listAll = list1.parallelStream().collect(toList());
List listAll2 = list2.parallelStream().collect(toList());
listAll.addAll(listAll2);
System.out.println(“—并集 listAll—”);
listAll.parallelStream().forEachOrdered(System.out::println);
// 去重并集
List listAllDistinct = listAll.stream().distinct().collect(toList());
System.out.println(“—得到去重并集 listAllDistinct—”);
listAllDistinct.parallelStream().forEachOrdered(System.out::println);
}
}