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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	static class Entry {
  8. 		public Entry(String name, int id) {
  9. 			this.name = name;
  10. 			this.id = id;
  11. 		}
  12.  
  13. 		public String toString() { return "(" + name + "[" + id + "])"; }
  14. 		public boolean equals(Object o) { return o instanceof Entry && name.equals(((Entry)o).name) && id == ((Entry)o).id; }
  15. 		public int hashCode() {
  16. 			// System.out.println("hashing " + toString() + "...");
  17. 			return name.hashCode();
  18. 		}
  19.  
  20. 		private final String name;
  21. 		private final int id;
  22. 	}
  23. 	public static void main (String[] args) throws java.lang.Exception
  24. 	{
  25. 		Set<Entry> set = new HashSet<>();
  26. 		set.add(new Entry("foo", 42));
  27. 		set.add(new Entry("bar", 1337));
  28. 		set.add(new Entry("foo", -1));
  29. 		for(Entry e : set)
  30. 			System.out.print(" [" + e.hashCode() + "]" + e);
  31. 		System.out.println();
  32. 	}
  33. }
Success #stdin #stdout 0.06s 380224KB
comments (?)
stdin 
Standard input is empty
stdout 
 [101574](foo[-1]) [101574](foo[42]) [97299](bar[1337])
https://ideone.com/QyRKyF
language:
Java (12.0.1)
created:
10 years ago
visibility:
secret

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