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  1. import java.util.*;
  2. import java.io.*;
  3.  
  4. class Main
  5. {
  6. 	public static void main(String[] args) {
  7.         IntegerType int1 = new IntegerType(1);
  8.         IntegerType int2 = new IntegerType(1);
  9.         Set<IntegerType> set1 = new HashSet<>();
  10.         set1.add(int1);
  11.         Set<IntegerType> set2 = new HashSet<>();
  12.         set2.add(int2);
  13.  
  14.         System.out.println(set1.equals(set2));
  15.     }
  16. }
  17. class IntegerType {
  18.  
  19.         private int value;
  20.  
  21.         public IntegerType(int value) {
  22.             this.value = value;
  23.         }
  24.  
  25.         public Integer value() {
  26.             return this.value;
  27.         }
  28.  
  29.         @Override
  30.         public int hashCode() {
  31.             final int prime = 31;
  32.             int result = 1;
  33.             result = prime * result + value;
  34.             return result;
  35.         }
  36.  
  37.         @Override
  38.         public boolean equals(Object o) {
  39.             boolean result = false;
  40.             if (o == null || o.getClass() != getClass()) {
  41.                 result = false;
  42.             } else {
  43.                 IntegerType integerType = (IntegerType) o;
  44.                 if (this.value == integerType.value()) {
  45.                     result = true;
  46.                 }
  47.             }
  48.             return result;
  49.         }
  50. }
Success #stdin #stdout 0.06s 32592KB
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https://ideone.com/M2XIwg
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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