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  1. import java.util.*;
  2.  
  3. class Test {
  4.  
  5.     public static void main(String[] args) {
  6.         List<Integer> a = Arrays.asList(1);
  7.         List<Integer> b = Arrays.asList(1,2);
  8.         List<Integer> c = Arrays.asList(1,2,3);
  9.         List<Integer> d = Arrays.asList(1,2,3,4);
  10.  
  11.         List<List<Integer>> test = Arrays.asList(d,b,c,a);
  12.         Collections.sort(test, ListSizeComparator.INSTANCE);
  13.         for (List<Integer> list : test) {
  14.             System.out.println(list.size());
  15.         }
  16.     }
  17.  
  18.     enum ListSizeComparator implements Comparator<List> {
  19.         INSTANCE;
  20.  
  21.         public int compare(List one, List other) {
  22.             return one.size() - other.size();
  23.         }
  24.     }
  25. }
Success #stdin #stdout 0.08s 380224KB
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https://ideone.com/rcmDbi
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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