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

class NamedKey {

    private final String name;

    public NamedKey(String name) {
        this.name = name;
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }
    
    @Override
    public boolean equals(Object o) {
        return o.equals(name.hashCode());
    }

}

class Main {
    private static final Map<NamedKey, String> items = new HashMap<>();

    private static void print(String name) {
        var world = new NamedKey(name);
        System.out.println(items.get(world));
    }

    public static void main(String[] args) {
        items.put(new NamedKey("univerce"), "Hello univerce!");
        items.put(new NamedKey("world"), "Hello world!");
        items.put(new NamedKey("happy"), "Hello Happy!");
        print("world");
    }
}