HashCodePrinter.java.html

  1  import java.util.HashSet;
  2  import java.util.Set;
  3  
  4  /**
  5     This program prints hash codes of countries.
  6  */
  7  public class HashCodePrinter
  8  {
  9     public static void main(String[] args)
 10     {
 11        Country country1 = new Country("Belgium", 30510);
 12        Country country2 = new Country("Thailand", 514000);
 13        Country country3 = new Country("Belgium", 30510);
 14  
 15        System.out.println("hash code of country1=" + country1.hashCode());
 16        System.out.println("hash code of country2=" + country2.hashCode());
 17        System.out.println("hash code of country3=" + country3.hashCode());
 18  
 19        // Add the countries to the hash set. 
 20  
 21        Set<Country> countries = new HashSet<Country>();
 22        countries.add(country1);
 23        countries.add(country2);
 24        countries.add(country3);
 25  
 26        // Print the set. Note that the set has two elements.
 27  
 28        System.out.println(countries);
 29     }
 30  }