fork download
copy 
  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. private static enum Type {
  11. 		A, B, C
  12. 	}
  13.  
  14. 	private static class Friendship implements Comparable<Friendship> {
  15. 		@Override
  16. 		public String toString() {
  17. 			return "[" + username + " type:" + type + "]";
  18. 		}
  19.  
  20. 		public Friendship(Type type, String username) {
  21. 			super();
  22. 			this.type = type;
  23. 			this.username = username;
  24. 		}
  25.  
  26. 		Type type;
  27.  
  28. 		public Type getType() {
  29. 			return type;
  30. 		}
  31.  
  32. 		String username;
  33.  
  34. 		public String getUsername() {
  35. 			return username;
  36. 		}
  37.  
  38. 		public int compareTo(Friendship another) {
  39.  
  40. 			if (!this.getType().equals(another.getType())) {
  41. 				// if type are not equal, so we might have at most one A
  42.  
  43. 				if (this.getType().equals(Type.A)) { // on left side
  44. 					return -1;
  45. 				}
  46.  
  47. 				if (another.getType().equals(Type.A)) { // or, on rightside
  48. 					return 1;
  49. 				}
  50. 			}
  51. 			// or we have on both sides or neither side
  52. 			return another.getUsername().compareTo(this.getUsername());
  53. 		}
  54.  
  55. 	}
  56.  
  57. 	public static void main(String[] args) {
  58. 		List<Friendship> list = Arrays.asList(new Friendship(Type.C, "aa"),
  59. 				new Friendship(Type.A, "cc"), new Friendship(Type.B, "bb"),
  60. 				new Friendship(Type.B, "aa"), new Friendship(Type.C, "cc"),
  61. 				new Friendship(Type.C, "zz"), new Friendship(Type.A, "bb"));
  62. 		Collections.sort(list);
  63. 		for (Friendship item : list)
  64. 			System.out.println(item);
  65. 	}
  66.  
  67. }
Success #stdin #stdout 0.1s 320320KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
[cc type:A]
[bb type:A]
[zz type:C]
[cc type:C]
[bb type:B]
[aa type:C]
[aa type:B]
https://ideone.com/5BsqqJ
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!