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  1. import java.util.ArrayList;
  2. import java.util.Comparator;
  3. import java.util.List;
  4.  
  5. class Ideone {
  6.  
  7.   public static void main(String[] args) {
  8.       final List<BodyOfWater> list = new ArrayList<>(List.of(
  9.           BodyOfWater.of(3.0),
  10.           BodyOfWater.of(1.0),
  11.           BodyOfWater.of(2.0),
  12.           BodyOfWater.of(null)));
  13.       list.add(null);
  14.       list.sort(Comparator.<BodyOfWater>nullsFirst(null).thenComparing(
  15.           BodyOfWater::getDepth,
  16.           Comparator.<Double>nullsLast(null).thenComparing(d -> d)));
  17.       System.out.println(list);
  18.   }
  19. }
  20.  
  21. class BodyOfWater {
  22.     private final Double depth;
  23.  
  24.     private BodyOfWater(Double depth) {
  25.         this.depth = depth;
  26.     }
  27.  
  28.     public static BodyOfWater of(Double depth) {
  29.         return new BodyOfWater(depth);
  30.     }
  31.  
  32.     public Double getDepth() {
  33.         return depth;
  34.     }
  35.  
  36.     @Override
  37.     public String toString() {
  38.         return "BodyOfWater{" +
  39.             "depth=" + depth +
  40.             '}';
  41.     }
  42. }
Success #stdin #stdout 0.11s 51340KB
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Standard input is empty
stdout
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[null, BodyOfWater{depth=1.0}, BodyOfWater{depth=2.0}, BodyOfWater{depth=3.0}, BodyOfWater{depth=null}]
https://ideone.com/TcHIPR
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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