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  1. import java.util.ArrayList;
  2. import java.util.HashSet;
  3. import java.util.List;
  4.  
  5. public class Main {
  6.     public static void main(String[] args) {
  7.         ArrayList<ArrayList<String>> arrayList = new ArrayList<>();
  8.         arrayList.add(new ArrayList<>(List.of("ad", "fast", "sf")));
  9.         arrayList.add(new ArrayList<>(List.of("sa", "sh")));
  10.         arrayList.add(new ArrayList<>(List.of("ad", "fast", "sf")));
  11.         arrayList.add(new ArrayList<>(List.of("hj", "kl")));
  12.  
  13.         HashSet<HashSet<String>> setOfSets = new HashSet<>();
  14.         boolean hasDuplicates = false;
  15.  
  16.         for (ArrayList<String> innerList : arrayList) {
  17.             HashSet<String> set = new HashSet<>(innerList);
  18.             if (!setOfSets.add(set)) {
  19.                 hasDuplicates = true;
  20.                 break;
  21.             }
  22.         }
  23.  
  24.         if (hasDuplicates) {
  25.             System.out.println("有重複的ArrayList。");
  26.         } else {
  27.             System.out.println("沒有重複的ArrayList。");
  28.         }
  29.     }
  30. }
  31.  
Success #stdin #stdout 0.09s 54824KB
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有重複的ArrayList。
https://ideone.com/JPzStp
language:
Java (12.0.1)
created:
35 days ago
visibility:
public

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