list交集、差集、并集、去重并集
// 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); // 去重并集 List<String> listAllDistinct = listAll.stream().distinct().collect(toList()); System.out.println("---得到去重并集 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);