• Java8获取两个集合的交集、差集、并集


    Java8获取两个集合的交集、差集、并集

    /**
    * @author nanfengxiangbei
    * @date 2022/6/10 14:17
    */
    public class CollectionsTest {

    public static void main(String[] args) {
    List<String> list1 = new ArrayList<>();
    list1.add("ACCOUNT1");
    list1.add("ACCOUNT2");
    list1.add("ACCOUNT3");
    list1.add("ACCOUNT4");
    list1.add("ACCOUNT5");

    List<String> list2 = new ArrayList<>();
    list2.add("ACC1");
    list2.add("ACCOUNT2");
    list2.add("ACCOUNT3");
    list2.add("ACCOUNT6");
    list2.add("ACCOUNT7");

    // 交集
    List<String> intersection = list1.stream().filter(list2::contains).collect(toList());
    System.out.println("---交集 intersection--->" + intersection);

    // 差集 (list1 - list2)
    List<String> reduce1 = list1.stream().filter(item -> !list2.contains(item)).collect(toList());
    System.out.println("---差集 reduce1 (list1 - list2)--->" + reduce1);

    // 差集 (list2 - list1)
    List<String> reduce2 = list2.stream().filter(item -> !list1.contains(item)).collect(toList());
    System.out.println("---差集 reduce2 (list2 - list1)--->" + reduce2);

    // 并集
    List<String> listAll = list1.parallelStream().collect(toList());
    List<String> listAll2 = list2.parallelStream().collect(toList());
    listAll.addAll(listAll2);
    System.out.println("---并集 listAll--->" + listAll);

    // 去重并集
    List<String> listAllDistinct = listAll.stream().distinct().collect(toList());
    System.out.println("---得到去重并集 listAllDistinct--->" + listAllDistinct);
    }
    }
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  • 原文地址:https://www.cnblogs.com/nanfengxiangbei/p/16364221.html
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