import java.util.HashMap;
import java.util.Map;

class Dog{
    public String name;
    public Dog(String name){
        this.name = name;
    }
    public boolean equals(Object o){
        if((o instanceof Dog) && (((Dog)o).name == name)){
            return true;
        }else{
            return false;
        }
    }
    public int hashCode(){
        return name.length();
    }
    public String toString(){
        return name;
    }
}

public class Test111226{
    public static void main(String[] args) {
        Map<Object, Object> m = new HashMap<Object, Object>();
        Dog d1 = new Dog("clover");
        m.put(d1, "DDDDOG");
        System.out.println(m.get(d1));
        d1.name = "magnolia";
        for(Object o: m.keySet()){
            System.out.println(o.hashCode());
            System.out.println(o.toString());
        }
        System.out.println("================");
        System.out.println(d1.hashCode());
        System.out.println(d1.toString());
        System.out.println("----------------");
        System.out.println(m.get(d1));
        
    }
}