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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class HashKey {
  8.  
  9.     private int keyPartOne;
  10.     private int KeyPartTwo;
  11.  
  12.     public HashKey(int keyPartOne, int keyPartTwo) {
  13.         this.keyPartOne = keyPartOne;
  14.         KeyPartTwo = keyPartTwo;
  15.     }
  16.  
  17.     public int getKeyPartOne() {
  18.         return keyPartOne;
  19.     }
  20.  
  21.     public void setKeyPartOne(int keyPartOne) {
  22.         this.keyPartOne = keyPartOne;
  23.     }
  24.  
  25.     public int getKeyPartTwo() {
  26.         return KeyPartTwo;
  27.     }
  28.  
  29.     public void setKeyPartTwo(int keyPartTwo) {
  30.         KeyPartTwo = keyPartTwo;
  31.     }
  32.  
  33.     @Override
  34.     public boolean equals(Object o) {
  35.         if (this == o) return true;
  36.         if (o == null || getClass() != o.getClass()) return false;
  37.  
  38.         HashKey hashKey = (HashKey) o;
  39.  
  40.         if (keyPartOne != hashKey.keyPartOne) return false;
  41.         return KeyPartTwo == hashKey.KeyPartTwo;
  42.     }
  43.  
  44.     @Override
  45.     public int hashCode() {
  46.         int result = keyPartOne;
  47.         result = 31 * result + KeyPartTwo;
  48.         return result;
  49.     }
  50. }
  51.  
  52.  
  53. class Ideone
  54. {
  55.  
  56. 	public static void main (String[] args) throws java.lang.Exception
  57. 	{
  58.         HashMap<HashKey, String> firstMap = new HashMap<>();
  59.         HashKey firstHashKey = new HashKey(1, 1);
  60.         firstMap.put(firstHashKey, "text 1");
  61.         HashKey secondHashKey = new HashKey(1, 2);
  62.         firstMap.put(secondHashKey, "text 2");
  63.         System.out.println(firstMap.get(firstHashKey));
  64.         secondHashKey.setKeyPartTwo(1);
  65.         System.out.println(firstMap.get(secondHashKey));
  66.  
  67.         System.out.printf("Map size: %d%n", firstMap.size());
  68.         System.out.printf("First entry value: %s%n", firstMap.get(new HashKey(1, 1)));
  69.         System.out.printf("Second entry value: %s%n", firstMap.get(new HashKey(1, 2)));
  70.  
  71.         for(Map.Entry<HashKey, String> entry: firstMap.entrySet()) {
  72.         	System.out.printf("Key: %s, value: %s%n", entry.getKey(), entry.getValue());
  73.         }
  74. 	}
  75. }
Success #stdin #stdout 0.04s 4386816KB
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stdin
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Standard input is empty
stdout
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text 1
text 1
Map size: 2
First entry value: text 1
Second entry value: null
Key: HashKey@20, value: text 1
Key: HashKey@20, value: text 2
https://ideone.com/pynBzV
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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