fork download
copy 
  1. import java.util.*;
  2.  
  3. public class Main {
  4. 	public static void main (String[] args) {
  5. 		Set set = new HashSet();
  6. 		Data d = new Data(1,"foo");
  7. 		set.add(d);
  8. 		set.add(new Data(2,"bar"));
  9. 		System.out.println(set.contains(d));
  10. 		d.field1 = 2;
  11. 		System.out.println(set.contains(d));
  12. 	}
  13.  
  14. 	public static class Data {
  15. 		int field1;
  16. 		String field2;
  17.  
  18. 		Data(int f1, String f2) {
  19. 			field1 = f1;
  20. 			field2 = f2;
  21. 		}
  22.  
  23. 		public int hashCode() {
  24. 			return field2.hashCode() + field1;
  25. 		}
  26.  
  27. 		public boolean equals(Object o) {
  28. 			if(!(o instanceof Data)) return false;
  29. 			Data od = (Data)o;
  30. 			return od.field1 == this.field1 && od.field2.equals(this.field2);
  31.  
  32. 		}
  33. 	}
  34. }
Success #stdin #stdout 0.07s 380160KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
true
false
https://ideone.com/6pVzQJ
language:
Java (HotSpot 12)
created:
10 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!