Java 中 List 集合取补集

妖狐艹你老母 2024-03-08 08:25 132阅读 0赞

**交集 Intersection 英 \[ˌɪntəˈsekʃn\]**  
**并集 Union 英 \[ˈjuːniən\]**  
**差集 difference of set**  
**补集 complement set 英 \[ˈkɒmplɪment\]**  
**[Java 中 List 集合取交集][Java _ List]**  
**[Java 中 List 集合取并集][Java _ List 1]**  
**[Java 中 List 集合取差集][Java _ List 2]**  
**[Java 中 List 集合取补集][Java _ List 3]**

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# 求两个集合交集的补集
    List<Integer> list1 = new ArrayList(Arrays.asList(1, 2, 3));
    List<Integer> list2 = new ArrayList(Arrays.asList(3, 6, 7, 8, 9));
    
    List<Integer> list3 = new ArrayList(list1);
    list3.removeAll(list2);
    List<Integer> list4 = new ArrayList(list2);
    list4.removeAll(list1);
    list3.addAll(list4);
    
    list1 :[1, 2, 3]
    list2 :[3, 6, 7, 8, 9]
    求两个集合交集的补集:[1, 2, 6, 7, 8, 9]

# 求两个集合交集的补集
    List<Integer> list1 = new ArrayList(Arrays.asList(1, 2, 3));
    List<Integer> list2 = new ArrayList(Arrays.asList(3, 6, 7, 8, 9));
    
    Collection s1 = CollectionUtils.subtract(list1, list2);
    Collection s2 = CollectionUtils.subtract(list2, list1);
    Collection union = CollectionUtils.union(s1, s2);
    
    list1 :[1, 2, 3]
    list2 :[3, 6, 7, 8, 9]
    求两个集合交集的补集:[1, 2, 6, 7, 8, 9]

# 求集合list1相对于List1和list2全集的补集
    List<Integer> list1 = new ArrayList(Arrays.asList(1, 2, 3));
    List<Integer> list2 = new ArrayList(Arrays.asList(3, 6, 7, 8, 9));
    
    List<Integer> union = new ArrayList(list1);
    union.addAll(list2);
    union.removeAll(list1);
    
    list1 :[1, 2, 3]
    list2 :[3, 6, 7, 8, 9]
    list1 的补集:[6, 7, 8, 9]

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**参考：**  
**[java 集合交集、并集、差集、补集1][java _1]**  
**[java 集合交集、并集、差集、补集2][java _2]**

[Java _ List]: https://blog.csdn.net/weixin_37646636/article/details/128378090
[Java _ List 1]: https://blog.csdn.net/weixin_37646636/article/details/128378917
[Java _ List 2]: https://blog.csdn.net/weixin_37646636/article/details/128378928
[Java _ List 3]: https://blog.csdn.net/weixin_37646636/article/details/132713502
[java _1]: https://blog.csdn.net/HaHa_Sir/article/details/126111603
[java _2]: https://release.blog.csdn.net/article/details/127851890