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  1. import java.util.ArrayList;
  2. import java.util.Arrays;
  3. import java.util.LinkedHashSet;
  4. import java.util.List;
  5. import java.util.Set;
  6. class M {
  7.     @Override public int hashCode() {
  8.         final int prime=31;
  9.         int result=1;
  10.         result=prime*result+Arrays.deepHashCode(b);
  11.         return result;
  12.     }
  13.     @Override public boolean equals(Object obj) {
  14.         if(this==obj) return true;
  15.         if(obj==null) return false;
  16.         if(getClass()!=obj.getClass()) return false;
  17.         M other=(M)obj;
  18.         if(!Arrays.deepEquals(b,other.b)) return false;
  19.         return true;
  20.     }
  21.     int[][] b=new int[3][3];
  22. }
  23. class SetEquality {
  24.     static List<Object> list(Object o) {
  25.         ArrayList<Object> l=new ArrayList<>();
  26.         l.add(o);
  27.         return l;
  28.     }
  29.     static Set<Object> set(Object o) {
  30.         Set<Object> l=new LinkedHashSet<>();
  31.         l.add(o);
  32.         return l;
  33.     }
  34.     public static void main(String[] args) {
  35.         M f=new M();
  36.         M g=new M();
  37.         System.out.println(f.hashCode());
  38.         System.out.println(g.hashCode());
  39.         List<Object> listWithF=list(f);
  40.         List<Object> listWithG=list(g);
  41.         System.out.println("lists: "+listWithF.equals(listWithG));
  42.         Set<Object> setWithF=set(f);
  43.         Set<Object> setWithG=set(g);
  44.         System.out.println("sets: "+setWithF.equals(setWithG));
  45.     }
  46. }
Success #stdin #stdout 0.08s 380160KB
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29612285
29612285
lists: true
sets: true
https://ideone.com/qPyWLh
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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