Hell.java

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import java.util.*;

public class Hell {

    public static final Devil d1 = new Devil();

    private static Map<Devil, String> jail;

    public static void main(String...args) {

        jail = new TreeMap<>( (o1, o2) -> ((Devil)o1).claw - ((Devil)o2).claw);

        //What helped Diablo to escape?

        jail.put(new Devil(), "Baal");

        jail.put(d1, "Diablo");

        jail.keySet().forEach(d -> d.kill()); 

        

                

        if (d1.alive) System.out.println("Diablo escaped!!");

        jail = new HashMap<> (jail);

        jail.put(d1, "Diablo");

        jail.keySet().forEach(d -> d.alive = false); 

        

        System.out.println(jail.size());

        System.out.println(jail.keySet().iterator().next().alive);

        System.out.println(jail.values().iterator().next());

        if (d1.alive) System.out.println("Diablo escaped!!");

    }

      public interface Evil {public void kill();}

    private static class Devil implements Evil{

        public void kill() {alive = false;}

        private boolean alive = true;

        private int claw = 666;

        public boolean equals(Object obj) {

            if(!(obj instanceof Devil)) return false;

            Devil d = (Devil)obj;

            return (claw - d.claw) == 0 ? true: false;

        }

        public int hashCode() {return claw;}

    }

}