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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.time.LocalDate;
  4. import java.time.Month;
  5. import java.util.Arrays;
  6. import java.util.Comparator;
  7. import java.util.List;
  8. import java.util.TreeSet;
  9. import java.util.stream.Collectors;
  10.  
  11. /* Name of the class has to be "Main" only if the class is public. */
  12. class Ideone
  13. {
  14. 	private static final List<Unique> uniqueList = Arrays.asList(
  15. 			 new Unique("a", null) 
  16. 			,new Unique("b", null) 
  17. 			,new Unique("b", LocalDate.of(2016, Month.SEPTEMBER, 20))
  18. 			,new Unique("c", LocalDate.of(2016, Month.SEPTEMBER, 19))
  19. 			,new Unique("c", LocalDate.of(2016, Month.SEPTEMBER, 20))
  20. 			);
  21.  
  22. 	public static void main(String[] args) 
  23. 	{
  24. 		System.out.println("list ordered, with duplicates: ");
  25. 		uniqueList.stream().sorted().forEach(System.out::println);
  26.  
  27. 		System.out.println("=================");
  28. 		System.out.println("list ordered, duplicates removed: ");
  29. 		Comparator<Unique> uniqueComp = (a, b) -> a.getName().compareTo( b.getName() );
  30. 		TreeSet<Unique> sortedFilterd = uniqueList.stream().sorted().collect(Collectors.toCollection(() -> new TreeSet<Unique>(uniqueComp)));
  31. 		sortedFilterd.forEach(System.out::println);
  32. 	}
  33. 	public static class Unique implements Comparable<Unique>
  34. 	{
  35. 		private String name;
  36. 		private LocalDate dateOfDeletion;
  37.  
  38. 		public Unique(String name, LocalDate dateOfDeletion) 
  39. 		{
  40. 			this.name = name;
  41. 			this.dateOfDeletion = dateOfDeletion;
  42. 		}
  43.  
  44. 		public String getName() {
  45. 			return name;
  46. 		}
  47.  
  48. 		public void setName(String name) {
  49. 			this.name = name;
  50. 		}
  51.  
  52. 		public LocalDate getDateOfDeletion() {
  53. 			return dateOfDeletion;
  54. 		}
  55.  
  56. 		public void setDateOfDeletion(LocalDate dateOfDeletion) {
  57. 			this.dateOfDeletion = dateOfDeletion;
  58. 		}
  59.  
  60. 		@Override
  61. 		public String toString() {
  62. 			 return "Unique [name=" +name + ", dateOfDeletion="+dateOfDeletion+"],";
  63. 		}
  64.  
  65. 		/**
  66. 		 * order based on name ascending, and date descending
  67. 		 */
  68. 		@Override
  69. 		public int compareTo(Unique rhs) {	
  70. 			Comparator<Unique> reverseDateComparator = (a, b) -> {
  71. 				LocalDate thisDodel = a.getDateOfDeletion() == null ? LocalDate.now().plusDays(1) : a.getDateOfDeletion();
  72. 				LocalDate thatDodel = b.getDateOfDeletion() == null ? LocalDate.now().plusDays(1) : b.getDateOfDeletion();
  73. 				return thatDodel.compareTo(thisDodel);
  74. 			};
  75. 			return Comparator.comparing(Unique::getName).thenComparing(reverseDateComparator).compare(this, rhs);
  76. 		}
  77. 	}
  78. }
Success #stdin #stdout 0.09s 711680KB
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list ordered, with duplicates: 
Unique [name=a, dateOfDeletion=null],
Unique [name=b, dateOfDeletion=null],
Unique [name=b, dateOfDeletion=2016-09-20],
Unique [name=c, dateOfDeletion=2016-09-20],
Unique [name=c, dateOfDeletion=2016-09-19],
=================
list ordered, duplicates removed: 
Unique [name=a, dateOfDeletion=null],
Unique [name=b, dateOfDeletion=null],
Unique [name=c, dateOfDeletion=2016-09-20],
https://ideone.com/wBfDwz
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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