import java.util.*;
public class CollisionTest {
    public static void main ( String [] args ) {
        String s = new String("ese");
        System.out.println( s.hashCode() );
        String ese = new String("ese");
        System.out.println( ese.hashCode() );
        // same hash right?
        Map map = new HashMap();
        map.put( s, 1 );
        map.put( ese, 2 );
        SomeClass some = new SomeClass();
        System.out.println( some.hashCode() );
        // still  same hash right?
        map.put( some , 3 );
        // what would we get?
        System.out.println( map.get( s ) );
        System.out.println( map.get( ese ) );
        System.out.println( map.get( some ) );
    }
}
class SomeClass {
    public int hashCode() {
        return 100727;
    }
}