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  1. import java.util.HashMap;
  2. import java.util.Map;
  3.  
  4. class Main {
  5.     static class Klucz {
  6.         private final String value;
  7.  
  8.         Klucz(String value) {
  9.             this.value = value;
  10.         }
  11.  
  12.         @Override
  13.         public String toString() {
  14.             return "Klucz(" + value + ")";
  15.         }
  16.     }
  17.  
  18.     public static void main(String[] args) {
  19.         Map<Klucz, Integer> mapa = new HashMap<>();
  20.         mapa.put(new Klucz("coś"), 5);
  21.         mapa.put(new Klucz("coś"), 8);
  22.         System.out.println(mapa);
  23.     }
  24. }
Success #stdin #stdout 0.09s 27892KB
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Standard input is empty
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{Klucz(coś)=5, Klucz(coś)=8}
https://ideone.com/ew7u9C
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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