java - HashMap returning null even though hashCode/equals are overriden -

i have hashmap maps custom object tokendocumentpair double. tokendocumentpair follows:

  static class tokendocumentpair {     int documentnum;     string token;     public tokendocumentpair(string token, int documentnum) {       this.token = token;       this.documentnum = documentnum;     }      public boolean equals(tokendocumentpair other) {       return (this.documentnum == other.documentnum && this.token.equals(other.token));     }      public int hashcode() {       int result = 1;       result = 37 * result + objects.hashcode(this.documentnum);       result = 37 * result + objects.hashcode(this.token);       return result;     }      public string tostring() {       return string.format("[document #%s, token: %s]", documentnum, token);     }   } 

the problem is, when create tokendocumentpair pair1 = new tokendocumentpair("hello", 1) , store hashmap<tokendocumentpair, double> map, , try fetch tokendocumentpair pair2 = new tokendocumentpair("hello", 1), returns null. however, under impression since hashcode , equals method match , based on 2 fields stored, hash map able find original pair1 , return value me.

tokendocumentpair pair1 = new tokendocumentpair("hello", 1); tokendocumentpair pair2 = new tokendocumentpair("hello", 1); assert pair1.hashcode() == pair2.hashcode(); // ok assert pair1.equals(pair2); // ok  hashmap<tokendocumentpair, double> map = new hashmap<>(); map.put(pair1, 0.0); map.get(pair2); // null map.containskey(pair2); // false 

what doing wrong here?

equals method not overridden. have overloaded it.

signature of method object#equals override must this:

@override public boolean equals(object o) {     //... } 

in order make sure you're overriding method, use @override annotation when declaring method. if add annotation current equals method, compiler error , proper error message.