import java.util.*;

// From http://www.javaspecialists.eu/archive/Issue222.html 
public class JavaChampionTest {
  public static void main(String... args) {
    Map<JavaChampion, String> urls = new HashMap<>();
    urls.put(new JavaChampion("Jack"), "fasterj.com");
    urls.put(new JavaChampion("Kirk"), "kodewerk.com");
    urls.put(new JavaChampion("Heinz"), "javaspecialists.eu");
 
    urls.forEach((p, u) -> System.out.println(u)); // Java 8
 
    System.out.println("URL for Kirk: " +
        urls.get(new JavaChampion("Kirk")));
  }
}
 
final class JavaChampion {
  private final String name;
 
  public JavaChampion(String name) {
    this.name = name;
  }
 
  public boolean equals(Object o) { // simplified equals()
    if (!(o instanceof JavaChampion)) return false;
    return name.equals(((JavaChampion) o).name);
  }
}