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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		(new Ideone()).solve();
  13.  
  14. 	}
  15.  
  16. 	private void solve() {
  17. 		int arr[] = new int[]{2,2,2};
  18. 		int n = arr.length;
  19. 		Pair pairs[] = new Pair[n];
  20. 		for(int i = 0; i < n; i++) {
  21. 			pairs[i] = new Pair(i, arr[i]);
  22. 		}
  23. 		TreeSet<Pair> set = new TreeSet<>((p1, p2) -> {
  24. 			if(p1.val == p2.val) return p1.idx-p2.idx;
  25. 			return p1.val-p2.val;
  26. 		});
  27. 		// HashSet<Pair> set = new HashSet<>();
  28. 		for(int i = 0; i < arr.length; i++)
  29. 		set.add(pairs[i]);
  30. 		System.out.println(set);
  31. 	}
  32.  
  33. 	class Pair {
  34. 		int idx, val;
  35. 		Pair(int idx, int val) {
  36. 			this.idx = idx;
  37. 			this.val = val;
  38. 		}
  39.  
  40. 		public int hashCode() {
  41. 			return idx;
  42. 		}
  43.  
  44. 		public boolean equals(Object ob) {
  45. 			return(this.idx == ((Pair)ob).idx);
  46. 		}
  47.  
  48. 		public String toString() {
  49. 			return("{ "+idx+", "+val+" }");
  50. 		}
  51. 	}
  52. }
Success #stdin #stdout 0.14s 56092KB
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Standard input is empty
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[{ 0, 2 }, { 1, 2 }, { 2, 2 }]
https://ideone.com/Td8Kh6
language:
Java (HotSpot 12)
created:
7 days ago
visibility:
public

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